Tendon pain at the bend of the leg, which refers to the back of the knee joint, should be treated according to different causes, such as rest, physical therapy, medication and surgery. 1. Cold and overwork: Cold or overwork may cause transient pain at the back of the knee, which can usually be improved by resting and keeping warm. 2. Chronic strain: Pay attention to rest, avoid overwork, massage, hot compresses, moxibustion, baking lamp irradiation, etc., or oral diclofenac sodium enteric-coated tablets, ibuprofen extended-release capsules and other medications for treatment. 3. Knee degeneration: avoid overloading the joints, pay more attention to warmth, oral celecoxib tablets, meloxicam tablets and other drugs when the pain is obvious, but also in the joint injection of sodium vitrate, in order to nourish the cartilage, lubricate the joints, relieve the pain symptoms. 4. Trauma: Trauma-induced pain, mainly to rest and recuperate, but also serious strain brace or splint fixation, and with the blood circulation and pain relief capsules, tendon activation tablets and other drugs to assist in the treatment, if the combination of meniscus or ligament serious injury, may require surgical treatment. 5. Lumbar spine lesions: avoid sitting and standing for a long time, can be traction physiotherapy and other auxiliary treatment, pain is obvious, you can take oral lumbar pain Ning ibuprofen extended-release capsules, diclofenac sodium and other drugs treatment. 6. Popliteal cysts: popliteal cysts increase in size and compress the tissues around the knee joint to trigger tendon pain, mainly to surgical resection. When the tendon pain behind the knee joint, through rest and warmth can not be improved, should promptly consult the doctor, follow the doctor’s instructions standardized treatment, do not blindly use drugs.