The Blood Sea point is on the inner side of the thigh, two inches above the medial end of the patellar base, at the bulge of the medial head of the quadriceps muscle. The Blood Sea Point, which has the effect of promoting blood circulation, dispelling wind and relieving pain, is commonly used clinically to treat pain around the knee joints as well as menstrual disorders, dysmenorrhea and menstrual closure, and metrorrhagia. It can also treat allergic diseases such as urticaria, addictive rashes and itchy skin. It can also treat diseases such as salpingitis and dribbling in the urine. It can also treat pain in the lower limbs due to blood stasis, and can treat subluxation as well as edema and diarrhea, and can be used in conjunction with acupoints such as Foot Sanli and Tianshu.