Involuntary muscle movements, also known as spasms, are sudden, uncontrolled contractions of a muscle or group of muscles. These spasms can be caused by a variety of factors, including nerve damage, dehydration, electrolyte imbalances, and certain medications. Spasms can cause pain and discomfort, and can sometimes interfere with normal activities. Treatment for spasms may include physical therapy, medications, and lifestyle changes.