Hemiplegia is paralysis in one side of the body due to the loss of strength and lack of control. Paralysis can occur in the muscles of the arm, leg and sometimes face in the affected side of the body.

Hemiplegia varies in degree and refers to severe or complete loss of strength, while hemiparesis refers to mild loss of strength.

Stroke is the most common cause of hemiplegia, but can also be caused by traumatic brain injury, spinal cord injury, brain tumors, and brain infections.

Symptoms of hemiplegia include:
- Difficulty breathing, swallowing, or speaking
- Problems with bladder control and bowel movements
- Paralysis in one side of the body