The pain on the right side of the knee after climbing may have the following two causes: first, meniscal injury, if there is a meniscal injury after climbing, there can be pain on the right side of the knee, which is caused by the injury of the lateral meniscus, and the pain is very significant when the knee joint is flexed or hyperextended. Second, tendonitis, there are ligaments on the outside of the right knee that stop here, if climbing leads to strain, there can be acute injury to the ligaments, resulting in pain on the right side of the knee, it is necessary to conduct a physical examination and take x-rays to exclude other diseases for diagnosis, often requiring closure therapy or physical therapy.