Foot and knee pain is considered to be related to strain, trauma, joint degeneration, gouty arthritis and other causes. 1. Strain: If you walk too much or exercise too much, it will cause joint strain and aseptic inflammation, which will cause pain. 2. Trauma: foot and knee injuries can also cause foot and knee pain if there are soft tissue injuries or fractures. 3. Joint degeneration: with age, joints will appear degenerative disease, joint cartilage degeneration damage, can also cause foot and knee pain. 4. Gouty arthritis: Gouty arthritis is caused by high levels of uric acid. When urate crystals are deposited in the joints, gouty arthritis is formed, which can also cause pain in the feet and knees. It can be seen that the causes of foot and knee pain are very many, you can go to the hospital to further identify the cause of the disease, and then targeted treatment.