In general, the incidence of postherpetic neuralgia is directly proportional to age. Morages (2001), a foreign physician, once counted a group of cases and came up with the following data: 4 % for 10-19 years, 2 % for 20-29 years, 15 % for 30-39 years, 33 % for 40-49 years, 49 % for 50-59 years, 65 % for 60-69 years and 74 % for 70-79 years; and the possibility of pain lasting >1 year in the 10-49 4-10% in the 10-49 year old group, 18-48% in the 50-79 year old group, and up to 10 years or more in individual patients. My pain center has seen patients who have had pain for 40 years. In addition, the following conditions are risk factors that can increase the incidence of postherpetic neuralgia: diabetes, long-term use of hormones or immunosuppressants, tumors, chronic fatigue, stress, mood swings, and a hostile work environment. The prevalence of postherpetic neuralgia is 15% in the head and face, 12% in the neck and collar, 55% in the chest and back, 14% in the lower back and abdomen, 3% in the sacrococcygeal region, and about 1% in the generalized region.