Although concussions are relatively mild brain injuries, you need a doctor to look at you. Typically, doctors try to manage symptoms and wait for the concussion to clear up on its own. As a result, you might take over-the-counter medicine to manage pain and be prohibited from doing strenuous exercise.
Many concussions clear up within a few months, though some people suffer from symptoms for much longer. Severe brain injuries can leave someone permanently impaired and in need of ongoing medical help.
If a brain injury is moderate to severe, then many patients will undergo rehabilitation as soon as possible. Rehab can help people learn how to do familiar tasks in a new way. It can also help people relearn how to walk or use their limbs after a devastating accident.