Worried About CTE After a Concussion? Here’s What the Science Actually Says

You Had a Concussion and Now You're Googling CTE at 2 A.M.

I know why you're here.

You got hit. Maybe it was a helmet-to-helmet, maybe it was a header, maybe you took an elbow going up for a rebound. You've had a headache for two weeks. Screens bother you. You feel foggy in class or at work. And somewhere in the middle of the night you started searching, and you landed on a headline about NFL players and brain disease, and now you're lying there wondering if you've already done something to yourself that can't be undone.

Let me tell you what I tell patients in my clinic every week.

First: nobody can tell you that you have CTE

Not me. Not your team physician. Not a neurologist at the best hospital in the country. Not an MRI, a CT scan, a blood test, or any cognitive test that exists.

Chronic traumatic encephalopathy can only be diagnosed after death, by a pathologist examining brain tissue under a microscope, looking for a very specific pattern of protein buildup deep in the folds of the brain. There is no living test. There are research criteria for something called traumatic encephalopathy syndrome, but they were built for studies, not for diagnosing patients, and they haven't been validated for clinical use.

I know that sounds like bad news. It isn't. Whatever you're feeling right now, whether that's the headaches, the fog, the dizziness, or the mood swings, nobody has told you those symptoms are CTE. Nobody can. Your brain has not handed down a verdict. You've just been handed a headline.

Second: those headlines aren't about you

You probably saw the study about NFL players, the one reporting that somewhere between 18.5% and 98.7% of them had CTE at death.

Here's what that number actually is. Researchers looked at 1,712 former NFL players who died over a 14-year period. About one in five of those brains were donated and examined. The low number assumes only the examined brains had CTE. The high number assumes every single brain they didn't examine had it.

That's not a measurement of how common the disease is. It's a measurement of how few brains were looked at. And the brains that were looked at weren't a random sample. Families donate when they're worried, when someone declined, or struggled, or died young. In that study, the donors had longer careers, more Pro Bowls, and more Hall of Fame inductions than the players who weren't donated. Nearly nine times as many donor deaths were suicides compared to non-donor deaths.

These were the families with the most reason to want answers.

Now compare yourself to that group. Those men played tackle football from childhood through college and then professionally, often for a decade, in an era before practice-contact limits, before anyone was pulled from a game for a suspected concussion, before return-to-play protocols existed. The researchers themselves wrote that their findings can't necessarily be generalized even to the broader football community, let alone to a high school midfielder or a college wrestler or a rec league hockey player.

In studies of people without that extreme career-long exposure history, CTE turns up rarely or not at all. One large European study of 310 autopsies found zero cases. A registry study that identified contact sport participation from yearbooks, a much less biased way of finding people, found it in 5% of exposed brains.

The honest scientific position right now is that the pathology is real. Whether contact sport causes it, in whom, at what level of exposure, and with what actual effect on someone's life, all of that is still open.

Anyone telling you the answer is settled is ahead of the evidence.

Third: your symptoms have a cause, and it's treatable

Here's the part nobody writes headlines about.

Concussion isn't one injury with one outcome. It shows up in patterns we can identify, and those patterns respond to different treatment. Two people can have the same injury, the same symptom list, and need two completely different plans.

If you're weeks out and still symptomatic, that is usually not evidence of permanent damage. It's usually evidence that nobody has figured out what is driving your symptoms, and how to treat it.

Fourth: the fear is part of the problem

I need to be direct with you about this one.

Anxiety and catastrophic thinking are among the most consistent predictors of a longer concussion recovery. That isn't because your symptoms aren't real. They are. But when you interpret every headache as evidence of a degenerative disease, you start to pull back from the things that actually help you recover. The 2 a.m. searching is making you worse. That's not a scolding. It's a clinical fact, and it's one of the few parts of this you have direct control over.

The most protective thing you can do for your brain right now is not to worry harder about a disease that can't be diagnosed in you. It's to get the injury you actually have properly evaluated and properly treated, because that is the exposure that matters, and it's the one still in front of you.

What to do now

Get a real evaluation if any of this applies to you:

- You're more than two to four weeks out and still symptomatic

- You were told to rest in a dark room and wait, and nothing has changed

- Nobody has assessed your neck, your dizziness, or your eye movements

- You've had more than one concussion

- Your symptoms are getting worse instead of better

- The anxiety about your brain has become its own problem

A proper concussion evaluation isn't a five-minute sideline check or doctor’s visit. It's a real workup that identifies what is actually driving your symptoms, and it ends with a plan.

Your concussion is treatable.

The Patel Concussion Institute provides comprehensive concussion evaluation and targeted treatment, including telehealth in 41+ states. If you're recovering from a concussion and not getting the answers you need, we can help. Click Here to Learn More

References

1. Bieniek KF, Cairns NJ, Crary JF, et al. The Second NINDS/NIBIB Consensus Meeting to Define Neuropathological Criteria for the Diagnosis of Chronic Traumatic Encephalopathy. J Neuropathol Exp Neurol. 2021;80(3):210-219. doi:10.1093/jnen/nlab001

2. Katz DI, Bernick C, Dodick DW, et al. National Institute of Neurological Disorders and Stroke consensus diagnostic criteria for traumatic encephalopathy syndrome. Neurology. 2021;96(18):848-863. doi:10.1212/WNL.0000000000011850

3. Daneshvar DH, Nowinski CJ, Abdolmohammadi B, et al. Prevalence of chronic traumatic encephalopathy at death in National Football League players: retrospective population based cohort study, 2008-21. BMJ. 2026;394:e100418. doi:10.1136/bmj-2026-100418

4. Forrest SL, Kril JJ, Wagner S, et al. Chronic traumatic encephalopathy (CTE) is absent from a European community-based aging cohort while cortical aging-related tau astrogliopathy (ARTAG) is highly prevalent. J Neuropathol Exp Neurol. 2019;78(5):398-405. doi:10.1093/jnen/nlz017

5. Bieniek KF, Blessing MM, Heckman MG, et al. Association between contact sports participation and chronic traumatic encephalopathy: a retrospective cohort study. Brain Pathol. 2020;30(1):63-74. doi:10.1111/bpa.12757

6. Collins MW, Kontos AP, Reynolds E, Murawski CD, Fu FH. A comprehensive, targeted approach to the clinical care of athletes following sport-related concussion. Knee Surg Sports Traumatol Arthrosc. 2014;22(2):235-246. doi:10.1007/s00167-013-2791-6

7. Schneider KJ, Meeuwisse WH, Nettel-Aguirre A, et al. Cervicovestibular rehabilitation in sport-related concussion: a randomised controlled trial. Br J Sports Med. 2014;48(17):1294-1298. doi:10.1136/bjsports-2013-093267

8. Leddy JJ, Haider MN, Ellis MJ, et al. Early subthreshold aerobic exercise for sport-related concussion: a randomized clinical trial. JAMA Pediatr. 2019;173(4):319-325. doi:10.1001/jamapediatrics.2018.4397

9. Patricios JS, Schneider KJ, Dvorak J, et al. Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport—Amsterdam, October 2022. Br J Sports Med. 2023;57(11):695-711. doi:10.1136/bjsports-2023-106898

About the author:

Shan Patel, PsyD, is a neuropsychologist and concussion specialist who completed his fellowship through the UPMC Sports Medicine Concussion Program. He is the Owner and CEO of the Patel Concussion Institute (PCI), a telehealth-based practice serving patients nationally via PSYPACT, and serves as Clinical Director of the University Orthopedic Care, Concussion Program, and Integrative Behavioral Health Program, overseeing operations across 14 hospital-based clinics in Florida.