Patients usually register for a neurology department for EMG. At the time of registration, the neurologist will issue a checklist and the patient will go to the electromyography room with the checklist. Electromyography is an important diagnostic tool in neurology, which can confirm or assist in determining nerve and muscle diseases, and also assist in determining the site, degree, scope and prognosis of nerve injury, and diagnose diseases as follows: 1. Neuropathy: nerve diseases or nerve injury caused by various reasons, patients have numbness, weakness, pain and other sensory abnormalities in hands and feet, and the degree of nerve injury can be determined by electromyography, and Determine the treatment method. In addition, EMG can determine the prognosis of facial nerve palsy, and can also diagnose the degree of nerve damage in cervical spondylosis and lumbar spondylosis; 2, neuromuscular junction diseases: such as myasthenia gravis; 3, muscle diseases: such as polymyositis; 4, other: EMG also has auxiliary diagnostic value for spinal cord and brain lesions. Since EMG requires needle stimulation of the muscles, it is not suitable for the frail elderly, hemophiliacs, patients with needle sickness, and heart disease patients.