Herpes zoster is a disease characterized by a rash and more intense pain caused by the varicella-zoster virus. The virus is usually latent in the neurons of the posterior root of the spinal cord. Once the body’s resistance is low, or in case of exertion, infection, cold and fever, anger and fire, the virus can grow and multiply again and move along the nerve fibers to the skin, causing intense inflammation of the affected nerves and skin. The rash is generally unilateral and distributed by nerve segments, with clusters of herpes and pain; the older the person, the more severe the neuralgia. The disease is known as herpes zoster in modern medicine and as snake bile sores and tangled dragons in folklore. Herpes zoster virus has which four major characteristics: 1, eclipse (that is, like to eat the nerve peripheral thick fibers, so that the nerve line exposed, which is the root cause of post-neuralgia); 2, wandering, resulting in repeated when the rash may appear elsewhere; 3, like the heat, the rash hot the worse, it is appropriate to apply cold; 4, recognize the time sex, in the night 12 ~ 3 o’clock activity is strong, so the sleep often woke up pain. What are the epidemiological characteristics of shingles? 1. Herpes zoster causes primary infection in people with no or low immunity, such as infants and young children, i.e. chickenpox; 2. After infection, the virus exists in the ganglion cells of the spinal or cranial nerves in latent form for a long time, and after being activated by certain factors, the virus reaches the skin from one or several ganglia along the corresponding peripheral nerves, causing recurrent infection, i.e. herpes zoster; 3. After having primary chickenpox, herpes zoster can recur, but Herpes zoster rarely recurs after the onset of herpes zoster, which is related to incomplete immunity (IgM response) after the onset of the former and complete persistent immunity (IgM response) after the onset of the latter; 4. Herpes zoster is often sporadic and is related to the immune function of the body. In the elderly, after local trauma, systemic lupus erythematosus, lymphoma, leukemia and patients receiving corticosteroids, immunosuppressants and radiation therapy for a longer period of time are significantly more susceptible than normal and have a prolonged and more severe course with more prominent posterior neuralgia. What are the clinical features of herpes zoster? Herpes zoster can occur in all seasons, with spring and autumn and humid days being the most common; herpes can occur on any part of the body, with the trunk and face being the most common; herpes is painful at the onset, and some patients continue to have pain after the herpes has crusted over; herpes and lesions are mostly distributed along a peripheral nerve and occur in bands on one side of the body, not exceeding The lesions are usually distributed along one of the peripheral nerves and arranged in bands on one side of the body, not exceeding the midline.