The causes of sudden jerking of the body are mainly physiological factors and pathological factors, which are analyzed as follows: 1. Physiological factors: on the one hand, it may be related to emotional excitement during the day, if you are too excited or anxious during the day, you will be prone to similar performance at night when you sleep. Excessive exercise or frequent high-intensity muscle stretching exercises may also cause excessive muscle contraction. Therefore, when relaxing and resting, it will lead to a sudden twitching and shaking of the patient. 2. Pathologic factors: this condition is mostly seen in adolescents or elderly patients. Adolescents are mostly related to rapid growth and development and increased demand for calcium. In the elderly, it is generally considered to be related to hypocalcemia caused by large loss of calcium ions. If it is caused by pathologic factors, timely consultation should be made to clarify the diagnosis and then carry out targeted treatment. If there is a sudden jerking of the body, it is recommended to consult a doctor in time.