Nerve block is to block the nerve conduction pathway of nociception. In other words, it blocks the vicious cycle of “pain → muscle tension or small vessel smooth muscle spasm → local ischemia → tissue hypoxia, metabolite accumulation → increased pain-causing substances → neuroplastic response → increased pain”. It reduces sympathetic excitability, dilates blood vessels, improves blood circulation and tissue metabolism. It also has anti-inflammatory effects, eliminating local non-bacterial and immune neuroinflammation. Treatment should be noted: 1. You should not be too full before treatment. Bathe or wash the affected area with warm water, and notify the doctor if there is skin breakage or infection. 2.If there is dizziness, nausea, panic or discomfort during the treatment, you should inform the doctor in time. 3.Sometimes the local pain can be aggravated after treatment, which is a reaction to the drug and generally reduces to disappear within 24 hours. 4.After treatment, numbness, fever, sweating, abnormal sensation and other reactions may occur locally and in the corresponding area. This is the normal reaction of the drug, which can disappear within a few hours. 5.After treatment, you should rest for about 30 minutes as prescribed by the doctor before leaving the hospital. Do not bathe within 24 hours after treatment. 6.After treatment, you should take rest, avoid excessive and strenuous exercise, and keep the skin at the drug injection area clean and dry for 48 hours. 7.Patients with diabetes, hypertension and coronary heart disease should take the initiative to tell the doctor during the consultation.