Sanyinjiao is located on the inner side of the lower leg, 3 inches above the tip of the inner ankle and behind the medial border of the tibia, and can be used to treat abdominal distension and other diseases. Sanyinjiao is one of the commonly used acupoints of the foot-taiyin spleen meridian, which is the meeting point of the foot-taiyin, syncope and shaoyin. This point is used to treat abdominal pain, intestinal tinnitus, abdominal distension, diarrhea, dysmenorrhea, menstrual irregularities, metrorrhagia (excessive menstrual flow or dribbling), dribbling, infertility, stagnant labor, spermatorrhea, impotence, enuresis, urination, dysuria, yin pain, impotence of the lower limbs (lower limb weakness, numbness, and pain), headache, vertigo, insomnia, and so on. Pregnant women are forbidden to needle Sanyinjiao points. When discomfort occurs, you should consult a doctor in time, under the guidance of the physician’s diagnosis and treatment, and not self-acupuncture, so as not to delay the condition.