Electrotherapy is physical therapy. First of all, various physical factors directly affect all parts of the body to improve local discomfort and symptoms, such as neck, shoulder, back and leg pain, general weakness, obesity, constipation and so on. And accelerate blood circulation and promote the excretion of toxic and painful substances in the body. Intermediate frequency electrotherapy, low frequency, ultrasound, semiconductor laser, infrared, magnetic therapy, wax therapy, etc. , is a typical representative of this effect. Secondly, various physical factors act on skin, muscles and other sensory organs (such as eyes, ears and nose) for benign stimulation, so that the brain can integrate them and regulate nerves or body fluids through the body, thus restoring and maintaining human balance, improving and eliminating symptoms such as irritability, insomnia, headache and chest tightness. Such as music therapy, biofeedback, color light therapy, aromatherapy, hydrotherapy, air ion therapy and so on. Mutual influence and synergy make the physiological indexes of human body return to normal. Physical factors play an irreplaceable role in the treatment of sub-health state.