Medial knee pain can be caused by muscle strain, ligament injury, meniscus injury, arthritis, etc. General treatment, physiotherapy, medication and surgery are required. 1. Muscle strain: Long-term activity and exertion at the knee can lead to accumulation of local lactic acid, which can cause pain at the inner side of the knee. It is necessary to pay attention to the rest of the knee joint, reduce activities, and apply local hot compresses to promote blood circulation and lactic acid metabolism. 2. Ligament injury: due to trauma, inflammation and degeneration and other factors can lead to medial collateral ligament injury, which can cause medial knee pain. It is necessary to avoid knee joint activities, and it is possible to protect the knee joint by fixing the brace, and it is possible to take anti-inflammatory and analgesic drugs such as Celecoxib orally under the instruction of doctor, and it is necessary to carry out surgical treatment in case of serious injury. 3. Meniscus injury: trauma or knee degeneration can cause meniscus injury, which can cause pain on the inner side of the knee. After meniscus injury, local activities should be avoided, and flurbiprofen ester cream can be used as prescribed by the doctor for analgesic treatment, and surgical resection or repair treatment is needed in case of serious injury. 4. Arthritis: when osteoarthritis of the knee joint occurs in the elderly, there may be symptoms such as pain in the inner side of the knee and limitation of activities. It can be treated with oral celecoxib as prescribed by the doctor, and sodium vitrate and glucocorticoid can be injected into the joint cavity for lubrication, anti-infection and repair of cartilage, etc. When the condition is serious, surgical treatment such as joint replacement can be carried out. 5. Others: Lumbar intervertebral disc herniation and bone tumors around the knee can also cause pain on the inner side of the knee, which need to be treated after clear diagnosis and treatment. When the inner side of the knee pain occurs, you should consult a doctor in time, which is conducive to the early relief of discomfort symptoms.