Myospasm is an involuntary contraction of an individual muscle or group of muscles. It can be roughly divided into clonic myospasm and tonic myospasm. Clonic muscle spasms are rapid repetitive contractions and relaxations of active muscles in a certain rhythm and without conscious control over a certain period of time, such as facial muscle spasms and muscle clonus of epileptic seizures. Tonic spasms are sustained muscle spasms where the muscle spasms are not rhythmic. After a sustained period of time, the muscle spasms may decrease. Typical disorders include rabies and tonic seizures of epilepsy. The common causes of muscle spasms are: 1. Fatigue: When the body is fatigued, the normal physiological function of the muscles changes. At this time, there will be a large accumulation of lactic acid in the muscle, and lactic acid will continue to cause muscle spasms. 2, electrolyte imbalance: sweating a lot during exercise, especially in hot weather, electrolytes will be lost in large quantities. The main components of sweat are water and salt, and salt is related to muscle contraction. Excessive loss of salt can irritate the muscles and cause cramps. 3, cold stimulation: in cold climates, especially when there is no warm-up exercise before the activity, such as when suddenly subjected to cold air stimulation or swimming, the muscles are prone to cramps. The main reason is that the muscles will become more excited due to the cold leading to. In life, physical exercise should be strengthened to improve health and fitness, especially to improve cold tolerance and endurance. Try not to do strenuous exercise when your body is in bad condition, especially when you feel tired, exhausted or hungry. Before exercising, careful preparatory exercises and warm-up are required. For the parts where muscle spasms often occur, you can first do a proper massage, do not suddenly do intense and powerful movements or strenuous exercise. This will avoid the pain caused by muscle spasms.