Hemiplegia is the total paralysis of one side of the body, including the arm, leg, and trunk on the same side. It can be caused by conditions that damage the brain such as stroke, brain injury, infection, or tumor. Symptoms vary but include difficulty walking, balance problems, weakness on one side of the body, and potential speech or swallowing issues. Treatment involves rehabilitation to regain mobility and function through exercises and therapies. Prognosis depends on the cause but recovery is often limited, though intensive rehabilitation can improve symptoms over time to prevent complications.