The term 'Sudden Twitch' can be summarized as a SPASM, which is a sudden, involuntary muscle contraction. Spasms can be caused by a variety of factors, including stress, fatigue, dehydration, and certain medical conditions. They can also be caused by certain medications or drugs. Spasms can range from mild to severe and can affect any muscle in the body. Treatment for spasms typically involves rest, stretching, and massage.