First, recent participation in excessive physical labor or excessive fitness leads to overwork of upper limb muscles, slight injury inside muscles, and muscle beating during recovery.

Second, the protrusion of cervical intervertebral disc compresses nerves, which leads to motor nerve conduction dysfunction and can also cause involuntary pulsation of upper limb muscles. Cervical traction, cervical microwave therapy, ultrashort wave therapy and iontophoresis of traditional Chinese medicine can gradually restore nerve function and eliminate muscle beating.

Third, if the ambient temperature is too low, the body can produce heat rapidly through the continuous contraction of skeletal muscles, and it will also show the muscle beating of upper limbs in low temperature environment.

To sum up, upper limb muscle beating is a normal physiological phenomenon in most cases, and a few cases are caused by diseases, which can be eliminated after treatment.