The brain consists of soft tissue surrounded by blood and spinal fluid. It shifts suddenly and knocks against the skull if a hard blow is given or if it hits something very hard. A concussion is a temporary change in the working of the brain when it is moved suddenly in this manner.

Concussions at times last a few moments. Sometimes it might be for just a few minutes that the patient is unconscious. Most of the time, people return to normal after a mild concussion. However, repeated concussions should be prevented as they could give rise to other medical problems. Boxers and football players fall in this category.

A bad blow to the head like a bike or a car crash could result in severe concussion. This is an emergency and should be treated as one. If the brain is seriously injured, there could be lasting problems with speaking, learning and movement.

A person’s behavior after a concussion depends on how forcefully the brain has been hit inside the head. Some people are not unconscious but cannot remember what happened at the time. This is amnesia. At times some feel dazed and groggy after a concussion. They are unsteady on their feet and unable to perform normal activities immediately. Some have a headache that lasts for some time. If the concussion is severe, there may be bleeding inside the brain. The person will act confused and is unable to remember his own name.

Thus, a concussion can be caused by hitting the back of the head. The gravity will depend on how severe the impact and consequent injury is.

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