In the clinic, there are many conditions that lead to pain in the bend of the thigh, that is, pain in the popliteal fossa area of the patient. For example, if the patient has been standing, squatting or sitting for a long time, or if the popliteal area of the thigh has been cold for a long time, it will hurt the semitendinosus muscle and semimembranosus muscle of the popliteal area, which will cause the qi and blood in the muscle to run poorly, and there will be stagnation of qi and blood stasis and obstruction of the meridian channels, and the patient will suffer from pain; and there is also a buildup of lactic acid in the popliteal area, and there is an obstacle to the lactate metabolism, which will also cause the pain phenomenon. After this phenomenon, you can instruct the patient to reduce standing, weight-bearing activities, at the same time, pay attention to the popliteal fossa part of the warmth, you can take a hot compress treatment, Chinese medicine fumigation, or with the ZhouLin frequency spectrometer baking electricity, microwave therapy, bioelectricity treatment, etc., can alleviate the clinical symptoms.