There are many reasons for this pain: 1, the patient has acute trauma to the popliteal area of the knee or chronic exertion, strain or prolonged standing, squatting, sitting, etc., which injures the semitendinosus, semimembranosus, popliteus and other muscle tissues in the popliteal area of the knee, which will produce pain If the patient has a cyst in the popliteal fossa, the pain will also occur because the cyst is compressing the tibial artery, tibial nerve and surrounding subcutaneous nerves. Therefore, after the painful phenomenon, the patient should reduce the standing weight-bearing activities of the lower limbs, but also pay attention to warmth, in the popliteal fossa area can be used orthopedic topical medicine, local Chinese fumigation or topical ointment to invigorate blood circulation, reduce swelling and pain, can reduce this painful phenomenon.