Arms keep jumping, may be a normal physiological reaction, or benign muscle bundle tremor, Parkinson’s and other diseases caused. 1. Physiological reaction: it is a normal muscle twitch, which is more common after exercise, and the symptoms will gradually decrease and disappear after stopping the exercise, and there is generally no other pathological reaction. 2. Benign myofascial tremor: it is mainly due to the phenomenon caused by muscle bundles and fibrous plasmatic twitching, which is related to emotional anxiety, irritability, or due to nerve damage, resulting in abnormal muscle discharges. 3. Parkinson’s: belongs to the primary tremor, usually occurs in the arm, fingers, the condition gradually aggravated, may involve the head, belongs to a chromosomal genetic diseases. Arms have been jumping, in addition to the above factors, but also to consider the environmental poisoning or the nervous system aging and other factors. It is recommended to observe first, if long-term so should go to the hospital in time, under the guidance of the doctor standardized treatment.