Double knee bending pain for a week did not get better may be knee synovitis, knee bone spurs, rheumatoid arthritis and other diseases caused. 1. Knee synovitis: Knee synovitis is usually caused by knee sprains and many kinds of intra-articular injuries, and patients will have symptoms such as knee swelling, pain and limited activities, and some patients’ pain will be aggravated when bending both knees. 2. Bone spurs in knee joint: Bone spurs in knee joint are mainly formed by the body’s self-protection and self-repair, and most of them are the result of slow degradation and aging of knee joint. Patients usually have no symptoms, but some of them will have pain symptoms when they move, such as pain when bending both knees, which lasts for a long time. 3. Rheumatoid arthritis: rheumatoid arthritis can also lead to double knee bending pain, is to erosive arthritis as the main symptom of autoimmune disease, patients in addition to pain, dysfunction, there will be joints, such as morning stiffness and other typical symptoms. If the double knee bend pain for a week did not improve this situation, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, targeted treatment.