Causes of paralysis on one side of the body include stroke, tumors or trauma. Blunt trauma to the right or left side of the head may result in paralysis on only one side of the body. The other side of the body remains unaffected. Any paralysis is cause for concern because it could indicate a stroke, a brain tumor or injury. If paralysis is due to a subdural hematoma, surgery will relieve the pressure on the right or left side of the brain and the paralysis will disappear. If any problem remains after surgery, some physical therapy may help.

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