You may have seen this phrase in an ER discharge note, a neurologist's report, a workers' comp letter, or after someone says, "The scan was normal, so you should be over it by now." That advice is often wrong. Post-concussion syndrome means ongoing symptoms after a concussion or mild traumatic brain injury that last longer than expected, such as headaches, dizziness, nausea, light sensitivity, sleep problems, memory trouble, poor concentration, irritability, or mood changes.

A common myth is that a person must have lost consciousness, hit their head hard, or shown damage on imaging for the condition to be real. Not so. Many people with post-concussion syndrome have normal CT or MRI results. The problem is the persistence of symptoms, not whether a scan looks dramatic. Symptoms can also show up in jobs with repeated jolts, falls, or machinery incidents, not just car crashes.

For an injury claim, this diagnosis can matter a lot because the effects are often invisible but still disruptive. It can support claims for ongoing treatment, missed work, reduced earning ability, and pain and suffering. Insurers may argue the symptoms are exaggerated, unrelated, or caused by stress. Detailed medical records, symptom tracking, and clear links between the injury and daily limitations can strengthen causation and damages in a personal injury or workers' compensation case.