Hemiplegia is paralysis, meaning a reduction or total cessation of body motion, which affects one of its sides. It can impact uniformly across the side of the body, face, upper limb, and lower limb in which case it is called proportional hemiplegia, or one or more of these parts. Hemiplegia is caused by damage to the central nervous system, affecting a part of the brain or spinal cord. If hemiplegia is on the left side of the brain, the right side of the body will present motor symptoms, and vice versa, the left side of the body will be affected in cases of injury to the right brain. The causes can be a stroke most frequently, and more rarely a tumor. The cause must be treated to promote healing, but hemiplegia can sometimes relapse, particularly in cases of stroke that resulted in irreversible brain damage.