There are many reasons for muscle throbbing in the arm, mainly due to calcium deficiency, overwork, mental stress, and so on. 1. Calcium deficiency: the lack of calcium in the body will lead to increased muscle excitability and throbbing. 2. Over-exertion: When exercising excessively for a long time or carrying a lot of weight in daily life, the muscles are stretched for a long time, and the throbbing phenomenon will occur after suddenly relaxing. 3. Mental tension: a long time of high mental tension, will make the muscles in a state of tension for a long time, the muscles can not be relaxed, a long time will lead to muscle overload, the phenomenon of throbbing. The arm muscle jumping may also have other reasons, such as cerebral hemorrhage hypertonia, cervical spondylosis compression of the nerves, etc., it is recommended to consult a doctor in a timely manner, improve the relevant examination, clear cause of the targeted treatment and treatment.