Herpes zoster etiology: Herpes zoster is caused by the same varicella zoster virus as chickenpox, in the absence or immune deficiency of the population first infected with this virus, in the clinical performance of chickenpox or recessive infection, after the virus into the nerve endings, and called persistent latent in the posterior root nerve of the spinal cord, in a variety of induced stimulation, can make the re-activity, growth and reproduction. Clinical manifestations: The disease occurs in spring and autumn, and is common in adults, usually preceded by fatigue, general malaise and pain in the affected skin, which is burning, stabbing, fluctuating or electric shock-like. The blisters gradually become cloudy and dry up after 7 to 14 days. Diagnosis: 1. It occurs on the head, face and trunk and can form dense clusters of papules, papules and blisters, and in more severe cases, there can be hemorrhagic blisters and necrosis. 2. The lesions are distributed in bands, generally not exceeding the midline of the body surface, and the distribution is related to the nerve segments. 3.Self-perceived pain, often before the appearance of lesions or at the same time with the lesions. 4.After the lesions fade, some patients may have residual neuralgia, which is easy to appear in the elderly. Treatment: 1, the treatment of antiviral drugs, commonly used drugs are acyclovir tablets, valacyclovir tablets, famciclovir tablets. 2, Acyclovir can be both oral and intravenous, the oral dose is 400mg, 5 times / day, but it is best to give the drug intravenously, and then during the administration of drugs! Patients should be advised to drink more water to prevent acyclovir from precipitating in the kidney tubules and causing damage to kidney function. 3.Vaxilovir can only be taken orally, and its oral absorption is fast, and its bioavailability is 3_5 times that of acyclovir, and the recommended oral dose is 300mg, 2 times/day. 4.Fanciclovir, generally administered orally, 250mg, 3 times/day for 7 days! With these three categories have an impact on kidney function, so the kidney function should be checked before use, and the dose should be adjusted for patients with impaired kidney function.