Posterior knee pain can be caused by meniscus injury, arthritis, synovitis, popliteal cyst, etc. General treatment, physical therapy, medication and surgery are feasible. 1. Meniscus injury: Trauma-induced injury to the posterior horn of the meniscus can cause the posterior horn of the meniscus to be squeezed by the tibia and femur in the knee joint cavity, resulting in posterior knee pain. Oral glucosamine and other nutritive articular cartilage drugs can be taken under the guidance of the doctor, and when the condition is serious, the meniscus needs to be surgically removed or sutured. 2. Arthritis: degeneration of the knee joint, local osteophytes and articular cartilage wear and tear can lead to pain in the posterior fossa of the knee. Need to rest the knee joint, reduce flexion and extension activities, oral celecoxib and other drugs to relieve pain, can be carried out at the knee massage, physiotherapy and hot compresses and other treatments, the serious condition of the feasibility of surgical replacement of artificial knee joints and so on. 3. Synovitis: due to the knee joint injury and degenerative changes can cause knee joint synovial inflammation, triggering the symptoms of pain in the back of the knee fossa. Loxoprofen sodium can be used for anti-inflammatory and analgesic treatment, and sodium vitrate can be injected into the joint cavity to nourish and soften the articular cartilage, and arthroscopic surgery can be considered if the effect of conservative treatment is poor. 4. Popliteal cyst: Popliteal cyst or bursa swelling backward can cause pain and swelling at the back of the knee. Popliteal cysts that cause pain are usually treated with open or arthroscopic surgery under the supervision of a specialist. When you have pain in the posterior knee socket, you should seek medical advice and treatment from a specialist to help relieve the pain and other symptoms.