Climbing stairs and knee pain, but not walking on level ground can be caused by knee arthritis, meniscus injury, ligament inflammation, etc. General treatment, drug treatment and surgical treatment are feasible. 1. Knee arthritis: Osteoarthritis of the knee joint, especially patellofemoral joint osteoarthritis, can cause knee pain when walking up and down the stairs, but no obvious pain when walking on level ground. It is necessary to pay more attention to the rest of the knee joint, can follow the doctor’s instructions to apply ibuprofen analgesic treatment, can be injected into the joint cavity of sodium vitrate nutrition and lubrication of articular cartilage, and in severe cases, surgical treatment. 2. Meniscus injury: injury or tear of the posterior horn or anterior horn of the meniscus of the knee, can be climbed stairs when the knee flexion and extension pain symptoms. Meniscus injuries need to consult a doctor for an MRI examination to clarify the condition, and according to the damage, arthroscopic partial meniscectomy or repair of the meniscus and other surgical treatments are feasible. 3. Ligamentitis: patellar ligament inflammation of the knee can occur when climbing stairs and other local excessive activities, pain symptoms, need to pay more attention to the rest of the knee, can be in the regular hospital massage, hot compresses, physiotherapy and other treatments, can accelerate blood circulation, promote the dissipation of inflammatory substances. You can also take anti-inflammatory and analgesic drugs such as Loxoprofen sodium under the guidance of a doctor, which can reduce the local inflammatory reaction and relieve the symptoms of knee pain. When the knee pain should be timely medical consultation, by specialists to clarify the condition of the appropriate treatment, will help early relief of knee pain and other uncomfortable symptoms.