Herpes zoster is an acute infectious skin disease caused by the varicella-zoster virus. Primary infection, varicella, can occur in people with no or low immunity (mostly children) after viral infection. Or the virus is recessively infected and spreads through the bloodstream to the sensory nerve endings of the skin, through the nerve pathway to the posterior root of the spinal nerve or trigeminal nerve, and then spreads to the neurons of the sensory ganglion of the cranial nerve. When the resistance is low or when the patient is tired, infected, or has a cold, the virus can grow and multiply again and move along the nerve fibers to the skin, and the latent virus multiplies, causing inflammation and necrosis of the ganglion and pain in the patient. At the beginning of the disease, the main manifestations are general fatigue and weakness, loss of appetite, mild fever, and soon the onset site feels burning and jumping pain. If it occurs in the chest or lower back, it is often misdiagnosed as heart disease or acute abdomen, etc. The rash is usually unilateral and distributed by nerve segments, with clusters of herpes consisting of pain; the older the person, the more severe the neuralgia. After the first to third day of herpes zoster, mung bean-sized, tense papules and blisters appear on the skin at the site of onset, distributed along the nerves and arranged in clusters in a striped pattern. If the rash occurs on the chest or waist, it is more likely to occur from the side of the spine diagonally downward, and rarely symmetrically. The folklore that a circle of herpes around the waist is life-threatening is not reliable. In mild cases, each cluster can be spaced with normal skin, but in severe cases, they can be fused into a large band-like distribution, and after a few days, they can change from clear blisters to cloudy pustules, and some can break down to form vesicles. In the elderly, the blisters are often large, bloody, and even necrotic. In mild cases, the blisters dry up naturally in about two weeks and crust over, leaving no scar after shedding; in severe cases, the course of the disease can extend to more than one month. Elderly patients often experience severe pain that affects sleep, and if treatment is not timely, pain remains after the lesions have subsided and does not completely subside for months. If herpes zoster appears on the head and face, be alert for headaches and facial paralysis due to invasion of the head and facial nerves. If the cornea of the eye is invaded, it can even lead to blindness. The disease can be more serious in older, weaker people and those with chronic diseases such as tumors. Care points】 1. The disease should be treated promptly to reduce pain. As patients often have varying degrees of pain, patients should be advised to actively cooperate with treatment, pay attention to maintain a relaxed mood, and ensure sufficient sleep time. 2, underwear should be soft, loose, clothes should be clean and pay attention to keep the local clean, dry, never scratch with hands to prevent infection, to avoid pain caused by friction. 3, at the same time should give patients high protein, high vitamin and easy to digest food, do not eat spicy stimulating food. 4.When the pain is severe, painkillers can be taken, along with red light irradiation and acupuncture treatment.