Herpes on the waist may be caused by varicella-zoster virus infection or activation of latent varicella-zoster virus in the body. 1. Contact with the patient is infected: people are the only natural host of varicella zoster virus, the patient is the only source of infection, can be transmitted through the air, direct contact. Recent contact with patients with herpes zoster may cause viral infection, which is characterized by a rash distributed in bands along the peripheral nerves, thus leading to herpes lumborum. 2. Latent virus is activated: children are susceptible to chickenpox in primary infection, and latent in the posterior root ganglia of the spinal cord or sensory ganglia of the cranial nerves after cure. When the body’s immunity is low, such as infectious diseases, radiotherapy, and excessive fatigue, the virus will be stimulated and activated, and the ganglia will be involved, resulting in segmental herpes and neuralgia. When herpes is found in the lower back, you need to seek medical treatment as soon as possible, under the guidance of the doctor, so as not to leave sequelae such as neuralgia.