A concussion is a brain injury that occurs when you receive a sudden blow or jolt to the head. It is a type of traumatic brain injury (TBI). Your doctor may call a concussion a “mild brain injury.” Most concussions are not life- threatening, but they can have serious effects. A concussion may lead to thinking, sleeping, and balance problems, and symptoms. In rare cases, a blood clot may form on the brain after a concussion. This is a life-threatening condition.

Post-concussion syndrome  is a condition that is typically associated with a head injury link to The head injury may be categorized as a concussion or a mild traumatic brain link to injury. In general terms, post-concussion syndrome, link to or PCS, is a medical problem that persists for a period of time after a head injury has occurred. This period of time can range from weeks to months.

Causes of Post-Concussion Syndrome

In general, post-concussion syndrome follows the occurrence of an injury or trauma to the head. Not all people who suffer mild traumatic head injury experience post-concussion syndrome. This syndrome may be worse in people who have had previous concussions or head trauma. It may also be more severe in those who have early symptoms of headache link to after injury, or who have mental changes such as amnesia, fogginess or fatigue link to . Other risk factors include younger age and prior history of headaches link to

Diagnosis of Post-Concussion Syndrome

Since symptoms can be vague and attributable to other reasons, it can be difficult to diagnose post-concussion syndrome. There is no definitive test for post-concussion syndrome. Diagnosis is mainly based on a history of head injury and reported symptoms. A physical exam link to , and perhaps a CT or MRI scan of the head, may be done to evaluate symptoms. Other tests may be given to rule out other causes of symptoms, such as infection, bleeding injury to the brain, or poisoning.

Symptoms of Post-Concussion Syndrome

Symptoms of post-concussion syndrome are often vague and non-specific.

Commonly reported symptoms include:

Headache ( link to )

Dizziness link to

Sleep link to problems

Psychological symptoms such as depressed mood, irritability, and anxiety

Cognitive problems involving memory, concentration, and thinking

Such symptoms can affect day-to-day life, and inhibit the ability to perform in situations like work.

Persistent headache, extreme drowsiness, slurred speech, and repeated vomiting or nausea. Follow the links below to find WebMD’s comprehensive coverage about concussion, how it develops, what the symptoms are, how to treat it, and much more

confusion or feeling dazed


slurred speech

nausea or vomiting


balance problems or dizziness

blurred vision

sensitivity to light

sensitivity to noise


ringing in ears

behavior or personality changes

concentration difficulties

memory loss

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