The surgical procedure known as 'amputation,' or removal of a limb, sometimes becomes necessary in cases of gangrene, cancer, or as the result of an accident.

Head injuries, also known as traumatic brain injuries, are injuries that result in damage to the brain. These types of injures are most common among males between ages 15 and 24.

Orthopedic problems can vary greatly in the amount of rehabilitation therapy they require. Some common sports-related injuries or simple bone fractures may only require a few hours of physical therapy.

Pain may be the result of injury, disease, surgery, or other medical procedures. It may also be brought on by stress or other emotional factors. How pain is treated depends on its cause, which should be diagnosed through a medical examination.

Blockage in an artery that leads to the brain can cause a stroke, which causes part of the brain to die from lack of blood flow. A stroke can be debilitating and many of the aftereffects may be permanent.