Convulsive movements, also known as spasms, are involuntary muscle contractions that can cause sudden and jerky movements of the body. They can be caused by a variety of medical conditions, such as epilepsy, multiple sclerosis, or cerebral palsy. Spasms can also be caused by certain medications, alcohol withdrawal, or even emotional stress. Treatment for convulsive movements depends on the underlying cause and can include physical therapy, medications, or surgery.