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For more on marking an answer as the "Best Answer", please visit our FAQ.An injury to the head causes the brain to bounce against the rigid bone of the skull. This force may cause a tearing or twisting of the structures and blood vessels of the brain, which results in a breakdown of the normal flow of messages within the brain.
Grade 1
The mild concussion occurs when the person does not lose consciousness (pass out) but may seem dazed.
Grade 2
The slightly more severe form occurs when the person does not lose consciousness but has a period of confusion and does not recall the event.
Grade 3
The classic concussion, which is the most severe form, occurs when the person loses consciousness for a brief period of time and has no memory of the event. E
valuation from a health-care provider should be performed as soon as possible after the injury.
A concussion can happen to anyone, at any time. The most common causes of concussion include a blow to the head from a motor vehicle crash, fall or assault.
The signs and symptoms of a concussion include severe headache, dizziness, vomiting, increased size of one pupil or sudden weakness in an arm or leg. The person may seem restless, aggitated or irritable. Often, the person may have memory loss or seem forgetful. These symptoms may last for several hours to weeks, depending on the seriousness of the injury.