Signs and symptoms
... The signs and symptoms of a concussion can be subtle and may not appear immediately. Symptoms can last for days, weeks or longer. Your behavior, mental ability and physical skills all are linked to sp...

Causes
... A violent blow to your head can cause your brain to slide forcefully against the inner wall of your skull. This can result in bleeding in or around your brain and the tearing of nerve fibers. A concus...

Risk factors
... Although many concussions result from sports injuries, they can occur whenever your head is subjected to a blow, such as in a car accident or from a fall. Some common risk factors include: Not wearing...

When to seek medical advice
... Seek medical advice after any blow to your head in which you have the signs and symptoms of a concussion. Although symptoms may not be immediately apparent, be sure to watch closely for subsequent phy...

Screening and diagnosis
... Diagnosing a concussion may involve several steps. Your doctor may ask questions about the accident and may conduct a neurological exam. This exam includes checking your memory and concentration, visi...