Do Concussions Heal on Their Own? Why Symptoms Last for Months

Do Concussions Heal on Their Own?

Many people improve within weeks, and most children and teens recover within several weeks (Chandler, 2026). In adults, recovery varies more: in a community study, a real share still had symptoms 3 months after the injury, and a similar share still had them at 12 months (Thorne, 2026). A substantial minority don't recover fully, and how many depends on how persisting symptoms are defined, so estimates vary widely (Pappolla, 2026). People with a high symptom score early on were much more likely to still have symptoms at 3 months (Thorne, 2026). In our clinic, the symptoms that stay often look a lot like dysautonomia: heart rate, blood pressure and brain blood flow that no longer respond the way they should when you stand, think or exert yourself.

Why Is My Concussion Not Getting Better?

A concussion can injure any part of the brain, and every concussion hits a different mix of systems. In our team's view, injuries with a twisting motion, like a car crash, an elbow to the face or a fall where the head turns, are more likely to strain fiber tracts deep in the brain. The brainstem, including the midbrain, holds centers for eye movement, balance signals, head and neck control and autonomic output, so damage there can show up in several places at once.

That's why 2 people with the same diagnosis can have very different problems. One person is dizzy, another can't concentrate, another has memory trouble, light or sound sensitivity, a blood pressure drop on standing or exercise intolerance, and some people have all of them. One patient's lingering dizziness and heart rate spikes traced back to how the eyes, inner ear and neck work together (how they were solved).

Our team sees the slowest recoveries in people with a high autonomic burden, where the system that runs heart rate, blood pressure and brain blood flow is far off target. A 2018 systematic review concluded that concussion likely causes autonomic nervous system changes, and that those changes may be one of the factors behind persisting symptoms and part of why concussion symptoms overlap with other conditions (Pertab, 2018).

In our experience, lingering symptoms often get filed under post-concussion syndrome and managed with rest, medications and time. DSM-5 and ICD-11 withdrew post-concussion syndrome as a distinct diagnosis, and the current framework provides no single category for its vestibular, eye movement (oculomotor), headache, autonomic, sleep and pain problems (Pappolla, 2026). Our team's position is that a label without testing those systems doesn't explain why you're still unwell. Medications can ease symptoms while those systems are tested and treated, and their ceiling is that they don't retrain eye movements, balance or how the brain regulates its own blood flow.

What Happens If You Don't Rest After a Concussion?

Research on rest after a new concussion favors a short rest followed by a gradual return to activity over long strict rest. 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). In our team's view, pushing hard while the brain's blood flow regulation is still off tends to bring symptoms on harder, so the dose of activity matters as much as the activity itself. Our team matches treatment to the systems testing finds and doses it to what each person can handle. For how rest and the return to activity work, see post-concussion syndrome treatment.

How Does a Concussion Change Blood Flow to the Brain?

After a brain injury, the link between working neurons and the blood vessels that feed them can loosen, which changes how much blood reaches the brain and how it's divided up. In our team's view, that's part of the healing response, and the problem starts when it doesn't reset. In our team's view, when the brain's regulation of its own blood flow stays disrupted, it can't fuel itself during demand.

For many people with lingering symptoms, standing is hard and standing while thinking is harder. In our team's experience, the system can't meet both demands, so blood flow drops further, which is why many people with lingering concussion symptoms can't tolerate school, work or busy social settings. Separately, a 2026 scoping review found 7 studies reporting more cognitive-motor interference, a drop in performance when walking and a thinking task are combined, in adults with persistent symptoms than in healthy controls (Büchel, 2026). Those studies measured performance, not blood flow.

Lying Standing Standing + thinking

Before injury After concussion

Replay

Why Does Vision Change After a Head Injury?

Some people notice their vision changes after a concussion.

In our team's view, the eyes themselves often check out fine, and the trouble sits in how the brain controls them. Our team also sees the brainstem and cerebellar areas that steer the eyes as closely wired to the areas that help regulate blood pressure, so an injury there can bring visual and autonomic symptoms together. The cerebellum and the balance nuclei that receive inner ear signals, for example, also tune blood pressure reflexes (Yates, 2014). If your pupils are different sizes or don't react to light after a head injury, get emergency care now. When unequal pupils after a head injury need the ER explains why.

How Does the Cerebellum Affect Concussion Recovery?

The cerebellum plays a part in both coordination and autonomic regulation. In physiology research (not concussion studies), it adjusts the gain of the reflexes that hold blood pressure steady when your head and body change position, through its connections with the inner ear's balance nuclei and the brainstem centers that regulate blood pressure (Yates, 2014). In our team's view, when an injury leaves the cerebellum off target, the reflexes that keep blood flowing to the brain during position changes lose their precision. Our team looks for that tie-in on the exam.

Is It All Anxiety?

In our team's experience, many people with a clear head injury are told their symptoms are anxiety and are treated with medication or counseling. Those can help, and in our team's view it's also fair to ask how a brain injury might make someone more anxious.

The brain has arousal systems, including the locus coeruleus in the brainstem and the nucleus basalis in the basal forebrain, that raise or lower alertness. In our team's view, an injury that affects those pathways can change arousal, and not knowing what's wrong with your own body raises anxiety on top of that. Anxiety, depression, insomnia and chronic pain overlap with concussion symptoms (Pertab, 2025). Anxiety or depression before the injury predicts a longer recovery (Déry, 2025), and a review of adults with persistent symptoms found, in its conceptual map, that overall symptom burden and anxiety were the central links to walking and executive function tasks (Büchel, 2026). Our team's position is that an anxiety label should start a closer look at the brain circuits involved, especially after a known injury.

What Should You Know If Your Concussion Isn't Healing?

• Autonomic changes after concussion may be one factor behind lingering symptoms (Pertab, 2018)
• In our team's view, vision changes after head injury are often about how the brain controls the eyes
• In our team's view, brain blood flow regulation can stay disrupted and drop further when you stand and think at once
• The cerebellum tunes both movement and blood pressure reflexes, so in our team's view an injury there can affect both
• In our team's view, testing the specific systems shows which ones haven't recovered and guides the plan

Concussions That Don't Heal: FAQ