There are several common reasons for arm muscle tremor: 1, acute injury to the muscle nerves of the upper limb, chronic strain, which is the most common reason. In daily work or sports caused by acute muscle strains, injuries, and long-term overload activities caused by chronic, persistent strain of the muscles and nerves, will cause local inflammatory reaction, under the stimulation of inflammation will appear muscle throbbing. 2, due to internal and external physical and chemical environment changes, stimulate the neuromuscular muscle muscle throbbing, common such as cold, in the temperature of the environment of the lower exposed limb Longer time, the contraction of blood vessels cause blood circulation is limited, the muscles are in a state of hypoxia will cause the accumulation of metabolic products, thus producing muscle throbbing. There are also abnormalities in the internal environment, in the acid-base balance imbalance, ionic disorders, calcium deficiency and other factors, the muscles will also appear nerve-muscle junction abnormalities, resulting in muscle throbbing. 3, cervical spondylosis is also a common cause of cervical spondylosis caused by nerve compression in the upper limbs, resulting in abnormal discharge of the nerves, which can produce this muscle throbbing.