A spasm is a sudden, involuntary contraction of a muscle or group of muscles that can cause temporary pain, stiffness, or restricted movement. Muscle spasms commonly occur in the legs, back, neck, or abdomen and may result from overuse, dehydration, electrolyte imbalances, nerve irritation, poor circulation, or prolonged static posture. In some cases, spasms may also be linked to underlying neurological conditions or systemic disorders. The affected muscle may feel tight or visibly twitch during an episode, which can last from a few seconds to several minutes. Treatment typically includes stretching, gentle massage, hydration, correction of mineral deficiencies, and addressing any contributing medical conditions, while persistent or frequent spasms may require medical evaluation.