Post-Concussion Syndrome Treatment: What Helps When Symptoms Last

You hit your head and were told to rest, so you rested, and weeks or months later you're still not right.

Maybe it's headaches, dizziness, brain fog, light sensitivity, a racing heart or fatigue that sleep doesn't fix. In a review of 13 studies and 5,307 children, about 1 in 3 still had symptoms 4 or more weeks after a concussion (Chadwick, 2022). The standard advice of rest, wait and avoid triggers leaves the cause untouched.

Our team's principle is to do the one right thing at the right dose and keep at it until it works. The dose has to be high enough to make a measurable difference and low enough not to flare symptoms. In a video on neurorehab, our team describes the brain as a stack of skills, so when the eyes land in the wrong position, reading takes more energy and symptoms can follow. Rehab starts with that eye movement in every position, then moves back up to reading and driving.

The approach comes from functional neurology, and another case of lingering symptoms shows how it is worked through step by step.

What Is Actually Broken After a Concussion?

A concussion disrupts several networks at once, and the problems that keep symptoms going don't show on a CT or an MRI. Ongoing symptoms very likely mean some areas of the brain still aren't working the way they should, so our team tests each system on its own instead of treating "post-concussion syndrome" as a single condition.

Eye Movements

Eye movement control is one of the most frequently disrupted functions after a concussion. Saccades, smooth pursuit, convergence and gaze stability all depend on precise neural timing. This is why reading becomes difficult, screens feel overwhelming, and some people see double in certain head positions. Our team measures all 4 with infrared eye tracking.

Vestibular System

The vestibular system processes head position and movement. After a concussion it often becomes inaccurate or delayed, producing dizziness, imbalance, motion sensitivity and the sense that the world isn't quite stable. Videonystagmography (VNG), rotary chair and computerized posturography show which components are affected.

The Neck

The sudden acceleration and deceleration that causes a concussion also loads the cervical spine. Neck dysfunction can produce headaches, dizziness and thinking symptoms that mimic post-concussion syndrome, and it's frequently overlooked because imaging looks normal. Our team examines the neck joints and movement, including how mobilizing the neck changes eye movements.

Autonomic Regulation

Many people develop exercise intolerance, heart rate variability changes and symptoms that look like POTS or dysautonomia. The brain's autonomic control centers can be affected directly, and rest alone won't resolve it. Heart rate variability analysis is covered in autonomic testing.

Cerebellar Timing

The cerebellum coordinates timing across motor, cognitive and emotional functions. Even mild cerebellar dysfunction can produce fatigue, slowed processing and coordination changes that people struggle to explain. Timing, coordination and predictive motor tasks bring it out.

How Do You Treat Dizziness After a Concussion?

When dizziness lingers, our team tests the eyes, the vestibular system and the neck as separate sources and picks the rehab from what each test shows. One case involved a person whose main complaints were memory problems, trouble focusing, fatigue and fog, who also had double vision in some head positions, after a history of several injuries. The latest injury was a slow-speed head acceleration and deceleration while wearing a helmet. Eye recordings in the dark showed downbeating nystagmus, where the eyes drift up and snap back down, which our team reads as a signal from the cerebellum. About 5 minutes after mobilizing the neck, the downbeating drift got smaller and the person said their eyes felt more stable and clear. That pointed our team to the neck-to-inner-ear-and-eyes pathway as the target for rehab. An eye finding like downbeating nystagmus belongs in a medical evaluation alongside any rehab plan.

Eye rehab has early imaging support too. In the CONCUSS trial, 54 people with concussion-related convergence insufficiency (trouble turning the eyes inward together) had fMRI before and after vergence and accommodative therapy, and activity in the vergence network increased (Sangoi, 2025).

The eye findings are covered in eye movement testing, and the cerebellum's role is in the little brain behind dysautonomia. For a case with dizziness, a racing heart and nausea, our team walks through the exam and the thinking behind it.

Why Does Exercise Make Post-Concussion Symptoms Worse?

Exercise intolerance often goes along with persistent symptoms (Valaas, 2026). Our team's view is that it reflects autonomic dysfunction, which matches the view of a 2018 review's authors (Leddy, 2018). In 31 concussed collegiate athletes and 31 controls, heart rate variability was lower on day 3 and back to normal by day 21 (Purkayastha, 2019). In a small study of 10 concussed athletes and 10 controls, tolerance to lower body negative pressure, a suction around the lower body that mimics standing, was impaired (Worley, 2021).

Brain blood flow is one of the things our team measures when symptoms persist, and a blood flow result is one clue among several. An autonomic problem isn't present in every case. Among children tested 4 to 6 weeks after injury, 3 of 64 with persisting symptoms met POTS criteria (Stein, 2026). For the related picture in POTS, see POTS exercise intolerance and why standard exercise advice fails POTS patients.

How Long Should Brain Rest Last After a New Concussion?

Our team's guidance is 7 to 14 days of rest after a new injury, followed by a graded return to activity. Rest is for those first days and weeks. Staying in strict rest past that point is where people get stuck, because the visual, vestibular and thinking systems stop getting the challenge they need to recover. The trials that tested rest used shorter windows. In one trial of 99 patients aged 11 to 22 seen within 24 hours of a concussion, 5 days of strict rest led to more daily symptoms than 1 to 2 days of rest followed by a stepwise return (Thomas, 2015). If your symptoms have lasted for months, the graded return below is the part that applies to you.

For why some concussions don't heal on their own, see what happens when a concussion doesn't heal.

What Does a Graded Return to Activity Look Like?

After the first days, the CDC pediatric guideline recommends a gradual schedule of activity that doesn't make symptoms worse, then progressive noncontact aerobic activity with close monitoring (Lumba-Brown, 2018). In adults, a randomized trial of 81 people 3 to 24 months after mild traumatic brain injury, all with persistent symptoms and exercise intolerance, compared aerobic exercise below the symptom threshold from a physical therapist plus usual care with usual care and general exercise advice. The exercise group's score on the Buffalo Concussion Treadmill Test, a treadmill test that finds the point where symptoms start to increase, improved at 12 weeks and stayed improved at 6 months. Symptom questionnaire scores improved in both groups and didn't differ between them, and no adverse events occurred (Valaas, 2026).

Staying under the threshold

Graded plan Rest only (assumed)

Graded plan (illustrative): each step sits just under the symptom threshold. After a step is held, the threshold creeps up, so the next step can be a little bigger. One step overshoots and brings on a flare, and the next step drops back.

Rest only (illustrative): activity stays near zero past the early rest band. Inactivity past the first days may worsen self-reported symptoms in children (Lumba-Brown, 2018).

Replay

Targeted Rehabilitation Versus Generic Treatment

Once we know which systems are affected and to what degree, treatment becomes targeted. Generic post-concussion care might include balance exercises and vision therapy. If your balance problem is driven by a specific semicircular canal dysfunction, generic balance exercises won't address it effectively. If your visual symptoms come from saccadic dysmetria rather than convergence insufficiency, standard convergence exercises miss the mark.

Targeted rehabilitation means:

• Exercises designed for your specific deficits
• Intensity set below your symptom threshold but high enough to drive neuroplastic change
• Multiple affected systems addressed together or in sequence, based on priority
• Progress measured with the same tools that found the deficits

In a 2026 crossover trial of 40 adults with symptoms for about 5 months, a standardized exam sorted people into autonomic, neck or vestibulo-ocular groups, and 6 weeks of rehab matched to the exam findings led to a clinically meaningful improvement on the Rivermead symptom questionnaire that held at 12 weeks. The group that started with symptom-based care improved significantly only after switching to the matched program (Moser, 2026).

What Does Recovery Look Like?

Recovery from persistent post-concussion syndrome takes consistent, targeted neurological rehabilitation, often weeks to months depending on severity and how long symptoms have been present. The brain remains capable of significant neuroplastic change even years after the injury, and our team regularly sees meaningful improvement in people who have been symptomatic for years. The key is precision: finding what's broken, targeting it specifically, and applying the right dose to drive recovery without triggering a flare.

When Should You See a Doctor?

A severe or worsening headache, repeated vomiting or symptoms that suddenly get worse after a head injury need urgent medical evaluation (Lumba-Brown, 2018). Our team's testing doesn't replace a medical evaluation for these signs.

Post-Concussion Treatment: FAQ

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