Electrotherapy equipment can be divided into low-frequency, medium-frequency, high-frequency, generally normal operation of the body has a certain therapeutic effect, there is no harm. However, if you do not follow the doctor’s requirements, too long, too large a dose of electrotherapy equipment, easy to nausea, vomiting, headache, dizziness and other adverse reactions. 1. Low-frequency electrotherapy instrument: it has a strong stimulating effect on motor nerves and sensory nerves, and is suitable for shoulder, waist, knee, etc. It can promote local blood circulation, excite neuromuscular tissues, and has obvious analgesic effect. 2. Medium-frequency electrotherapy instrument: it has obvious excitation effect on muscle tissues, and is clinically applied to treat cervical spondylosis, lumbar spondylosis, scarring hyperplasia, urinary retention and other diseases. 3. High-frequency electrotherapy instrument: can play a role in relieving spasm, anti-inflammatory pain, improve blood circulation, usually can be used to treat a variety of chronic inflammation. If the patient in the application of electrotherapy equipment in the process of discomfort, should promptly go to the hospital, with the doctor symptomatic treatment.