Traumatic Brain Injury Signs and Symptoms

Signs and Symptoms (summer)

The signs and symptoms of a traumatic brain injury (TBI) can be subtle. Symptoms of a TBI may not appear until days or weeks following the injury or may even be missed as people may look fine even though they may act or feel differently.

If any of the following symptoms appear suddenly or worsen over time following a TBI, especially within the first 24 hours after the injury, people should see a medical professional on an emergency basis.

Common Signs and Symptoms of a TBI

People should seek immediate medical attention if they experience any of the following symptoms:

  • loss of or change in consciousness anywhere from a few seconds to a few hours
  • decreased level of consciousness, i.e., hard to awaken
  • convulsions or seizures
  • unequal dilation in the pupils of the eyes or double vision
  • clear fluids draining from the nose or ears
  • nausea and vomiting
  • new neurologic deficit, i.e., slurred speech; weakness of arms, legs, or face; loss of balance

Other common symptoms that should be monitored include:

  • Headache
  • Light-headedness, dizziness, vertigo, or loss of balance or coordination
  • Sensory problems:
    • blurred vision, seeing stars, or eyes that tire easily
    • ringing in ears
    • bad taste in mouth
    • loss of sense of smell or taste
  • Sensitivity to lights, sounds, or distractions;
  • Mood changes or swings. agitation (feeling sad or angry for no reason), combativeness, or other unuaual behavior
  • Feelings of depression or anxiety
  • Fatigue or drowsiness; a lack of energy or motivation
  • Changes in sleep patterns (sleeping a lot more or having a difficult time falling or staying awake), inability to wake up from sleep
  • Problems remembering, concentrating, or making decisions
  • Slowness in thinking, speaking, acting, or reading

Headache, dizziness, confusion, and fatigue tend to start immediately after an injury, but resolve over time. Emotional symptoms such as frustration and irritability tend to develop later on during the recovery period. Many of the signs and symptoms can be easily missed as people may appear healthy even though they act or feel different. Many of the symptoms overlap with other conditions, such as depression or sleep disorders.

In some cases, repeated blows to the head can cause chronic traumatic encephalopathy (CTE) – a progressive neurological disorder associated with a variety of symptoms, including cognition and communication problems, motor disorders, problems with impulse control and depression, confusion, and irritability. CTE occurs in those with extraordinary exposure to multiple blows to the head and as a delayed consequence after many years. Studies of retired boxers have shown that repeated blows to the head can cause a number of issues, including memory problems, tremors, and lack of coordination and dementia. Recent studies have demonstrated rare cases of CTE in other sports with repetitive mild head impacts (e.g., soccer, wrestling, football, and rugby). A single, severe TBI also may lead to a disorder called post-traumatic dementia (PTD), which may be progressive and share some features with CTE. Studies assessing patterns among large populations of people with TBI indicate that moderate or severe TBI in early or mid-life may be associated with increased risk of dementia later in life.2

Children: TBI Signs and Symptoms

Children with a brain injury can have the same symptoms as adults, but it is often harder for them to let others know how they feel. Call your child's doctor if they have had a blow to the head and you notice any of these symptoms:

  • Changes in eating or nurseing habits
  • Persistent crying, irritability, or crankiness; inability to be consoled
  • Changes in ability to pay attention; lack of interest in a favorite toy or activity
  • Changes in the way the child plays
  • Changes in sleep patterns
  • Loss of skill, such as toilet training
  • Loss of balance or unsteady walking
  • Vomiting
  • Tiredness or listlessness
  • Changes in performance at school

Effects on Consciousness

A TBI can cause problems with arousal, consciousness, awareness, alertness, and responsiveness. Generally, there are four abnormal states that can result from a severe TBI:

  • Brain death
    The lack of measurable brain function and activity after an extended period of time is called brain death and may be confirmed by studies that show no blood flow to the brain.
  • Coma
    A person in a coma is totally unconscious, unaware, and unable to respond to external stimuli such as pain or light. Coma generally lasts a few days or weeks after which an individual may regain consciousness, die, or move into a vegetative state.
  • Vegetative state
    A result of widespread damage to the brain, people in a vegetative state are unconscious and unaware of their surroundings. However, they can have periods of unresponsive alertness and may groan, move, or show reflex responses. If this state lasts longer than a few weeks it is referred to as a persistent vegetative state.
  • Minimally conscious state
    People with severely altered consciousness who still display some evidence of self-awareness or awareness of one's environment (such as following simple commands, yes/no responses).2
Posted on BrainLine December 1, 2017. Reviewed July 6, 2018.

About the Author

BrainLine offers authoritative information and support to anyone whose life has been affected by brain injury or PTSD: people with brain injuries, their family and friends, and the professionals who work with them.

BrainLine is a national service of WETA-TV, the flagship PBS station in Washington, D.C. Learn more >


1. Centers for Disease Control and Prevention (CDC), Facts about concussion and brain injury, 2017.
2. National Institute of Neurological Disorders and Stroke, National Institutes of Health, 2015. Updated July 6, 2018.

Comments (99)

Please remember, we are not able to give medical or legal advice. If you have medical concerns, please consult your doctor. All posted comments are the views and opinions of the poster only.

Hi I have a 24 year old son who was in an accident when he was 11. Recently he's been having these lumps coming up around his ears. Is this connected to the contusion?what are the long term implications with regards to this?

Hi there, I had a severe concussion after being bottled over the head with a full bottle of beer and I think was hit again then all around the body. I was told it was a severe concussion and would go in 3 months but over 12 months later still had severe post concussion migraines . The first 6 weeks I was like a zombie then crying non stop the suicidal then angry in my own world. I still have neuropathathic pain in the neck which radiates to the brain as well I have hypercusis which could be manieres disease . I had parathesia in hands and feet with severe weakness in my legs and vertigo. Eventually they put me on endep which helps with the neuropathic pain tinititus sensitive to sounds. I have PTSD WHICH ISNT as bad due to seeing an EDMR phycologist. It’s been over 2 years then my disc collapsed in my back so sciatica. I was misdiagnosed twice and feel that medical staff did not know what was wrong and just wanted to get rid of me even after asking for more testing. If I do for example any boxing training it seems to twitch the neck then then neuropathic pain starts and my brain feels like it’s in a vice. Anyway would love some feedback? Regards Ramesh from Australia.

hi so my name is carly. i’m 18 and when i was 9 i ran full force into a cement wall and knocked my self out for several hours along with breaking my nose in several places and a possible bone fracture but i can’t be sure because my parents wouldn’t take me to the doctor. i wasn’t able to feel pain from it once waking up for about 15-20 min and i was bleeding a lot from my nose for about an hour. since then i’ve been having daily headaches, i developed depression, anxiety, eating disorders, insomnia, and ptsd shortly after when i was about 10. i also developed tremors in my hands, constant irritability, aggressiveness, intense mood swings, loss of appetite, trouble hearing in my left ear, constant muscle pains and involuntary jerks in my legs and arms. my back hurts when i stand up for more than 30 min and i can’t focus. i started failing school because i lost all interest in everything and could no longer concentrate or organize my thoughts. my vision blurs when i blink sometimes and then just goes away. my eyes are sensitive to light since then as well. i would spend most days crying or feeling like i was in pain with no apparent reason. i developed terrible eyesight almost immediately after. i’ve been to the doctor multiple times and nobody has been able to tell me anything. all of these symptoms have persisted for about 8 years. i don’t know if any of these things are connected or not but if anyone has any idea please let me know.

Hey I can relate very well. When I was around that age I tried to hang of a 7 foot basketball rim and I slipped upon momentum change and I dove head first(right side of forehead): i have been noticing similar feelings, lightheadedness, physical tension on left side of body, vision, muscle spasm, tiredness, maladaptive daydreaming and so on.

Been almost 2 weeks since I had a brain tumor removed still have headaches and dizzy and blurred vision feel frustrated at times and forget things any suggestions

Look up EWOT. and HBOT. ,then brain state technologies -neuro feedback....take lecithin, omega oils. Same for person above .

Lastly look up piracetam & choline

I was in a car that was hit from the side and rolled our car over and over,I seemed unhurt at the time, until a couple of days later my voice went completely I was unable to speak for around 3 months every time I tried to speak nothing came out ,I was 4 years old at the time. It was an emotional upset that caused my voice to return and I was able to speak, It was great having a voice again and a noise when I coughed. I did not see this symptom on the list so thought I would mention it .

I was beaten in the head by a group of guys when I was a teen. I was unconscious for over 8 hours. My head and face were swollen to unrecognizable. I never told anyone. I have severe social anxiety, depression and ptsd. No one has ever connected the two so I am wondering if my lack of control and these other issues could be caused by damage to my brain from this beating?

I also had that happen and yes all of the symptoms too
About 8 bullies 4 years older than me, when I was only 12

OMG you poor sweet baby!! No one was able to connect the two? Then you are seeing the wrong doctors! I truly hope that you are able to find someone close to your area that can help and that you can figure out how to do that!
Best of luck to you!

Most definitely!!! Research TBI as much as you can!

My name is Sarah. I am 44. I am new to this and I'm hoping somebody can point me to the right direction or specialists', doctors,etc. or what I need to have done as far as CTS or MRIs etc. I sustained a traumatic head injury (so far, only 1 MRI was done {on the night of the incident} in June 2014) from a tree snapping in half from straight line winds (about 70 to 80 miles an hour)... I was outside watching the weather (my dad has always taught us about the weather since we were able to walk) and I noticed that the winds (bushes across the road) we're NOT going clockwise OR counterclockwise: they were doing both @ the same time in the bushes . There were power lines that caught it. I was rushed (and I mean rushed) to the closest hospital: the E.R. Dr. Stated that I "only" had broken ribs and blood in my lungs. This was 5 years ago {06-06-2014 (Jonesboro, Ar)} ... 5 Years ago and I've had strokes, major headaches, they've pronounced me dead once at my house this past August, i NEVER forget things but I have very short term memory, I have syncope {blackouts}, my blood pressure is high but it bottoms out & I pass out, etc. Can someone, any advice, comments, please.... help me, maybe point me in the right direction. they're not (avoiding) answering my questions of any or IF I "could" have some (either major OR minor) sort of brain injury/trauma. I've had SO many opinions, all conflict the other. Oh, please, anyone. I'm asking for help, or comments, or even questions.!????

As some have said on here, I too have fallen down my stairs and hit my head severely. I’m 300 lbs and I slammed my right temporal lobe into a 2x6 at the bottom of the stairs.

It was a year ago in March and I feel like I’ve finally been getting myself back. Well 2 days ago I got into the back seat of my sedan not realizing that the roof was lower that it is in the front (or the seats higher?) and I smacked my temple. Same one I’ve hit. I’ve also had concussions on the same side. Now it’s painful and sore (I didn’t hit it hard enough to warrant a new injury) it feels like the old injury is flared up.

Has anyone had this happen? I’m now terrified that if I ever hit my head again it will be deadly.

Is this my life sentence?
TBI sucks.
Positive energy to everyone

Hi .my 16-month daughter fell from a chair in subways and I nearly lost her it was really bad .she was unconscious for what seemed forever then when I brought her round it was such a struggle to keep her from going unconscious again.anyway she stood on a ball 2 days ago and went flying but this time it was on a thick rug and also a carpet. It knocked her out! But the knock didn't justify knocking her out. I'm thinking has she a fracture. But they won't scan her because the radiation is far worse than what they may find.i have her on rains ALL of the time even in the house cos I'm scared it will happen again.and the next time I may not be so lucky to bring her round

I was in an abusive relationship in 2000-2001. My partner hit my head against floors, walls, a steel pole. I sometimes had no noticeable effect at the time, so I had no idea I had even had a concussion. Often I would become unconscious the next day and could not be woken up for 6 hours or so. At other times I would black out on and off. And other times I would become very dizzy. Interestingly, the time I did go unconscious for many hours was a blow to my face (pushed in the center of my nose. Broke my nose but Irish X-ray technicians did not notice) though maybe the injury was from the fall. That was about 7AM. I blacked out for a short time and woke up and called out from work. Passed out again and woke up at noon and made a doctors appointment. Woke at 5 which was close to the appointment. We had a doctor in our housing complex.

So in reading I am surprised that long periods like that are uncommon.

Anyway I got out in 2001 and came home. I was in a depression so heavy that other than therapy I stayed in bed for about 5 years. At one point the head of psychiatry for NYC came to analyze me and I was the most depressed case he had seen. He put me on stage for a lecture.

At that point, my memory loss (I have three degrees and can’t remember them), confusion, loss of balance, exhaustion, and other symptoms of TBI were attributed to depression. As time grew on, and my emotional symptoms improved, certain symptoms remained. In about 2010 it occurred to me that I might have a head injury. So I was never diagnosed. Because we do not have single payer medical care, Th fact there is no concussion clinic in New Jersey meant that I simply could not be seen, as my Medicaid did not pay for out of state.

So here I am, in 2019 with a TBI not treated for 18 years, like a football player.

I searched online for how old TBIs are treated, and the only treatment anyone sme to have any relief from was marijuana. The theory is that even after so long, there is swelling in the brain, and marijuana is an anti-inflammatory.

I have moved to Connecticut. I will be able to look into this.

Dear Natasha,I do not know if you will even see this. I was in a serious car accident years ago and had 95% brain damage. I also broke every bone in my body but my right arm and leg. I took every day Magnesium capsules, and now also powder, and vitamin E and Lecithin. I take rose hip capsules for arthritis but as they are anti inflammatory they should help with the inflammation even in your brain, I have gone through an early menopause and curcumin with black pepper has helped me. I took it for the bone pain as I need another hip replacement but it has helped me get through menopuase without hormones or operations .I cannot stress vitamin B enough for people to take against depression, exhaustion. Grants liquid B is so fantastic but hard to get here in AUstralia now. When I was taking so many antiinflammatory drugs for pain before my first hip replacement years ago i had better relief by taking 2 magnesium capsules 3 times a day. I now take MSM powder when I a unwell with pain. it regrows your cartillage but has an ingredient to help depression bipolar,etc...You may find you need to walk every day because when you take a lot of vitamins one does put on weight e it a go....Bless you, I pray God helps you. Deborah Australia.

I'm so sorry you went through all that. I'm from Connecticut myself and was in an abusive relationship from 2003 to 2009. I, too, have had the same depression you speak of. I was staying with a friend after the relationship ended and I stayed in bed for many years as well. He said I was the most depressed person he'd ever seen. The only reason I am somewhat functional now is because of anti depressants. I wonder if I have a brain injury as well. I've been punched in the head more times than I can remember. My memory is awful. I've been diagnosed with depression, anxiety, ADHD and post traumatic stress. I had my nose fractured and I still have a scar above my eye from being punched. It was like I was a UFC fighter or something.
I can't do marijuana because it gives me anxiety... even the indica, often gives me anxiety.
What does your life look like now? And what are you doing for treatment?

Hi Natasha,
I'm sorry to hear your story, it gives me flash backs to my own relationship in 1992. I was slammed against a concrete wall several times once and it never happened after that. Unfortunately, I was pregnant at the time and I did not know. I am here 24 years later have been diagnosed with migraines, depression, anxiety and recently with ADHD. I have had MRI's and everything comes back normal. But I have been having numbness on my head at random times which worries me. I really need to look into this and make sure my doctor takes this information serious enough to referred me to neurology. At times, I have trouble remembering things and can get things confuse. My son was born healthy with no health problems but all my three children have been diagnosed with depression. I don't know if this is genetics which most likely it is, because my other siblings seem to have some sort of psychological issues. I do not want to end my life with dementia. I want to be aware of everything and live a great life until the end.

I was so sorry to read your post. I just want you to know I will pray for you and am sending hugs your way. I pray you have peace.

When I was a teenager I was riding a skateboard down a steep hill without a helmet. The board flew out from under my feet and the back of my head slammed on the ground. I didn't lose consciousness, but my body went numb and there was clear fluid coming out of my nose. I didn't go to the hospital. Since then I have had these signs. I mentioned this to a neurologist once after having seizures and they said they didn't find anything on a CT or MRI. I have been taking seizure med for years after having around five and have had one in a long time. Even though I see a doctor frequently sometimes I worry about sudden death. Always wear a helmet.

in the year 2000 i fell 30 feet out of a deer stand & landed on my head & shoulder. i rolled 65 feet down a valley . My small intestine bleeding my colon bleeding. air med to hospital & had amnesia for 3 months. That was almost 2o years ago. Now i can’t remember anything to well & have headaches . Is there a time limit legally to try & get disability from this accident?

in the year 2000 i fell 30 feet out of a deer stand & landed on my head & shoulder. i rolled 65 feet down a valley . My small intestine bleeding my colon bleeding. air med to hospital & had amnesia for 3 months. That was almost 2o years ago. Now i can’t remember anything to well & have headaches . Is there a time limit legally to try & get disability from this accident?

In general, being considered disabled is based on your condition and limitations at the present time.

If you are concerned about getting disability benefits, you need to talk to an attorney and your doctors.

I was in a car accident in 2006, 120 mph head on collision, & I was not wearing a seat belt. Miraculously no one was killed but I was severely injured. I didn't have health insurance or car insurance at the time so I was basically just stitched up and sent home with no aftercare instructions or advice whatsoever. Prior to that I had had a few less severe but still fairly traumatic head injuries and have had a few knocks to the Head afterwards too. And now I am finding it nearly impossible to function, communicate or do the normal daily things that I need to do to get by for me and my family. It's making me insane, I feel stupid half the time and I don't know what to do.

Call a lawyer

I was working for a men I cutting trees will tree feel and hit me in the head it cracks my skull broken my neck in 4 place it broke my cheek bone I was in intensive care in Winston-Salem they made me leave without the man I work for head no insurance I have no money so they made me leave cancelled all my doctor's appointment now I'm having problems are completely deaf keep having ringing in the ears and I still don't have no help format man I work for more or less they just kicked me under the rug like I was a piece of trash I need the help but I have no money if anyone sees this can you please help me

You may need a variety of doctors like this to find the help you need.

My husband's similar situation was helped by different specialists working together, including a psychiatrist, a team of neurologists that included 3 neurologists, 1 neuro-psychiatrist, and two sleep specialists. That team worked together with his endocrinologist, pain management doctor, and psychiatrist. All worked with our primary care physician. We had other doctors in there, too, because two doctors moved out of state and one retired. And we went through a few years to get everything sorted out and have optimal therapies and medications and help. Not all therapies or medications worked, and not all worked well. The multiple diagnoses were all related to head injury.

I made sure that our primary care physician had a copy of all test results and kept him updated throughout the year. All worked with our primary care physician.

We had pen and paper with us at each visit, but I took notes only when the doctors told us what tests they wanted to do, and why, or test results, or possible treatments, or what they suspected, or what they wanted to try or next.

However, my husband could not do this coordination or taking notes by himself. I did most of the work, which was quite cumbersome. I suggest you seek a relative or friend who will accompany you to each doctor appointment to take notes for you and make sure you sign the forms needed so the doctors can share their medical information with each other. This person needs to know about all your medications, to, not just the ones given for conditions related to head injury.

My boyfriend had a wreck where his brain was black 12 years ago he said he can tell he's changing stress bothers him more and our relationship is not loving much no more. I would like 2 know about the side affects

Wow this is so crazy I've been trying to find this for ever! Back in 2013 a firework hit me and exploded in my eye. And I'm completely blind and have multiple surgeries on it. Anyway for the past 2 years I've had a pressure on my head like it feels like it's contracted physically. And it makes my eyes really tired, like I'm never fully awake. And all my mental illnesses sky rocket. Anyone else expierence this!?

On the 14th January 2019, I simply fell down the stairs at home. I have only 12 straight stairs but this caused a massive traumatic brain injury, broke the base and most of the right hand side of my skull, caused a Subarahnoid Heamorage and blood clots. My family were told I would never survive the ambulance journey to hospital, medical staff said numerous times that I would die, this was in front of my two small children. Then they told my family to find me a care home as I would never walk, talk, know who anybody was or have a memory.

Within one week of coming out of my coma I had a miracle recovery. I have been told by my Neurologist that the speed and extent of my recovery is extremely rare. I have posted this message so that people who have a loved one in my previous position can see that medical professionals are not always correct. I sincerely hope that anybody experiencing my history has my kind of recovery.

Good luck,


Since my TBI I fall down stairs a lot. I just moved into a house with extremely steep stairs. The stairs from first floor to second floor just lans me either against the wooden door or on the wooden floor. I have done that a few times. But the stairs to the cellar lead to a cement floor and cement wall. I always go down with my arms out.

My solution, which I am in the middle of implementing, is judo mats on the floor and wall. It will look dumb and I will have to work hard to make it visible so others do not trip. But it may well save my life.

In my childhood, a caregiver slammed my fore head on other child’s fore head and caused us to have black out and nose bleed at the same time and it’s happened many time . Never told anyone when I was little. Now I’m 56 and getting black out and loud noise in my brain , been going dr many time, few months ago I went to Er because I had black out or dizzy and fell on concrete and hit my face and messed up my shoulder. It’s been on and off for years. I have memories lost too.

My brother was in a car accident at age 15. Was in a coma for three months. He is 58 now and having more difficulty walking. Slurs speech. Falls pretty regularly. Is this going to continue to get worse. He tends to think he can do things that he cannot do anymore.

So here is my situation:

I got hit by a car back in November/December 2015, I do remember when I got hit, I actually flew a couple of meters away from the car. It all happened so fast, however, I did not lose consciousness I got up and my head was pounding like someone left a huge amount of heavyweight on my head. I never got the chance to get it checked the pain stayed for a good month or so and then somehow things seemed like they were back to normal. Now in 2019, I just noticed I tend to forget things quicker than I use to before like way quicker and important stuff as well. I am an individual with good eyes for detail and remember a lot of important details from the past. I know it is very stupid that I never got it checked I guess I was very afraid and going through a very traumatic time. I do suffer from PTSD and I have dealt with severe depression and anxiety as well. I would like to get it checked, but I am not sure what to do..

Call a lawyer

Consider having a neuro-psychiatrist evaluate you as well as a neurologist.

Hi, I'm sorry to hear that this happened to you. I would highly suggest going to see your general practitioner/doctor. Hopefully that will give you some peace of mind from what you are experiencing.

When I was younger I fell down my stairs at 3 year old. I was in a coma

I get bad headaches., repeat stuff and say things I don't mean. I also get dizzy and fatigue and I can't do certain things that others can. I can't get a full time job because the headache can come worse, then I get dizzy and throw up. It also puts pressure on my eyes

Is there any kind of help for these headaches?

I'm not sure of your age now but try marijuana.
I was in an accident and prescribed medications did nothing until I tried oil

Really working on the neck helps. Massage, Chiro no adjustments just deep painful massage, Endo cranial drainage, Botox in TMJ then kinesiology to help strengthen the neck. Vision can also be a HUGE factor... look into vision therapy... TBI is a painfully long exhausting recovery

Hello, i hit my head for the second time in the same place, my forehead above my left eyebrow going to the center of my forehead, I didn't pass out , it stunned me, I have an old wooden door on my pantry i keep screwing on its the size of the wall I say about 6 ft maybe, the door would literally come down hitting me , I never went to the doctor, its been about 4 months or so , I'm having headaches really bad , I don't know .......

Hi Rebecca,
I too hit my head and didn't go to the doctors this was about a week and a half ago. 
My daughter accidentally pulled the hatchback down on my head. It hurt really bad, but then it went away.

Now a week and a half later I am getting swelling on my head in the shape of a grape and it's very tender with a purple mark. My right side of my head hurts down to my ear with a headache.

I don't really know what else to do except ice it a couple of times a day it seems to help.  I'm not having any other symptoms as to a concussion
Are you? Look up symptoms.

Hope you are feeling better, if not I'd go to the doctors.


Here is my story.
In 2009 I had a fall off a ladder,I am not sure if I lost consciousness. I had headaches off and on for a couple of months.
Now in March 2016 carrying o root of vinyl flooring with two other guys, the cement under my feet was broken up. My footing was lost and I went down on my back hitting my head on the concrete. This time I lost consciousness for about 7-10 minutes.
Naturally I have seen many doctors MRI showed negative. I went for rehab. Am very depressed and still having symptoms such as ringing in ears constantly,headaches,foggy brain and dull acke in head,and fatigued.
I manage keeping these symptoms by not being around a lot of activity and people or noise.
Feel hopeless now as really not much better but learning to batch chores,cooking etc. which I learned in rehab it helps. My sleeping since has been terrible. Concentration and short term memory has been singniftly affected.
So I stay away from people,noise,music which I loved and find myself son fatigued I have to rest often.
Yes I have tried meds and am on Celebrex and oxcycodene for my back. ,bropopin for my mood and Ambien which only take as needed.
Well sorry to go on and thank you for taken the time to read my problems.Ralph

I had the Cochlear implant 6 months ago... I have this metallic taste in my mouth that make me want to vomit. Is there any cure for this. I have been to 5 doctors that just send me away with no answer...

Try taking Chlorophyll. That may help. I had a bad taste, like a metal taste in my mouth several years ago and was told to take Chlorophyll (greens) when I went to a health food store. And it worked.

You should see your doctor ASAP. If your Dr will not help keep going until you find one that will. A leak of cerebral spinal fluid can have a bad metallic taste. This is not necessarily what is going on, but if it is it is very serious. If you have a leak, it should be diagnosed & repaired to protect your brain.

Do you also have metal fillings in your teeth or other metal in your mouth? You may be getting some kind of interaction between the implant and those metallic elements in your mouth. Consider talking to your dentist about this.

You need to know which implant you have. Some have metal in them (titanium, platinum) and the implant surgeon rarely checks for biocompatibility (they say "most" people don't have problems) I would not give up on getting an answer. Once you know which implant you have, you can file a formal adverse reaction to the FDA. Don't stop searching! Just be ready for the possibility of having a revisional surgery.