Knee pain may be osteoarthritis, rheumatoid arthritis, gout, meniscus injury, you can apply non-steroidal painkillers, anti-rheumatic drugs, uric acid-lowering drugs or nutritive cartilage drugs. 1. Osteoarthritis: It is caused by joint degeneration and can be treated with oral non-steroidal painkillers such as aceclofenac tablets or diclofenac sodium enteric-coated tablets, and sodium vitrate can be injected into the joint cavity. 2. Rheumatoid arthritis: oral anti-rheumatic drugs such as Leflunomide or Hydroxychloroquine, non-steroidal painkillers such as Celecoxib or Diclofenac sodium enteric-coated tablets. 3. Gout: Colchicine can be taken orally for acute gout, and uric acid-lowering drugs such as febuxostat or allopurinol can be taken orally for remission. 4. Meniscus injury: you can take oral nutritional cartilage drugs such as glucosamine sulfate capsules. Oral blood circulation and swelling drugs can also be taken, such as bone marrow capsule or Sanqi injury tablets. Conservative invalid need to be performed to protect the meniscus suture surgery. Knee pain needs to go to the hospital to find out the specific cause of the disease, to take medication, physical therapy or surgery to treat the cause. The above drugs should be used under the guidance of a doctor, avoid self-medication.