The occurrence of dysmenorrhea Dysmenorrhea is defined as pain in the lower abdomen before and after menstruation or during menstruation, with lumbago or other discomfort, and the degree is so severe that it affects the quality of life and work, is one of the most common symptoms of gynecology, divided into primary and secondary two categories. According to the survey, the incidence of primary and secondary dysmenorrhea is about 69.1%, among which the incidence of moderate and severe dysmenorrhea affecting work and life is about 38.2%. The mechanism of primary dysmenorrhea Primary dysmenorrhea is common in young women, who have dysmenorrhea soon after menarche. Most of the diseases are related to plant nerve disorders and spasmodic contractions of the uterus, and some of them may be caused by uterine dysplasia, cervical stenosis and excessive flexion of the uterus, which affect the smooth flow of menstrual blood. Prostaglandins are synthesized and released by the uterus as an important cause of primary dysmenorrhea. The prostaglandin content in the endometrium and menstrual blood is significantly higher in dysmenorrhea than in normal women, and the higher the concentration of prostaglandins in the endometrium, the more severe the dysmenorrhea. Prostaglandins stimulate excessive contraction of the uterus and produce spasmodic pain in the lower abdomen, while excessive contraction of the uterus can cause insufficient blood supply to the uterus, ischemia and hypoxia, which stimulates pain neurons and causes pain. It has been found that after sympathetic excitation, the amount of prostaglandins released from peripheral nerves increases. The treatment mechanism of stellate ganglion block for dysmenorrhea The SGB method can inhibit sympathetic tension, maintain the stability of the neurological environment in the hypothalamus, regulate the plant nerve, endocrine function and immune function, and inhibit the production of inflammatory mediators such as prostaglandins. Most of the stresses are caused by the stimulation of the hypothalamic vegetative nerves through the cerebral cortex and limbic system, especially the sympathetic nervous system, which triggers sympathetic nervousness and causes peripheral vasoconstriction, impaired circulation and insufficient blood and oxygen supply, thus contributing to the dysfunction of the neurological, immune and endocrine interconnections in the hypothalamus, resulting in various pains and/or diseases. The effect of SGB is to block, regulate and improve this abnormal pain and pathological process, and then promote its recovery. Efficacy and prognosis Efficacy criteria Clinical cure: all clinical symptoms disappear, and no recurrence for more than six months. Effective: all symptoms are obviously improved or there is occasional vague pain in the abdomen during menstruation or recurrence within six months. Ineffective: No change or aggravation after blockade. Clinical cure was reported in 76.19-80.5%; effective in 15.18-16.7%; ineffective in 2.8-7.13%. The total effective rate was 92.17-97.2%. Compared with NSAIDs and prostaglandin inhibitor analgesics alone, the efficacy is more durable and the recurrence rate is lower. It has also been reported in China that after 1-3 courses of stellate ganglion block therapy, all patients treated were cured and had no recurrence at 2-year follow-up. V. Evaluation The SGB method is an effective, simple, and safe treatment method that is inexpensive and has good social benefits. Although there are some risks and experienced anesthesiologists are required to perform the treatment, the benefit/risk ratio is very high, and more obstetricians and gynecologists and women suffering from dysmenorrhea should be aware of this method and establish the status of the treatment accordingly in the field of dysmenorrhea treatment.