Cold pain in the kneecap when hot may be caused by fasciitis, osteoarthritis, synovitis and so on. 1. Fasciitis: due to long-term soft tissue wear and tear, caused by aseptic inflammation of the soft tissues around the knee joint, the patient may appear kneecap cold pain in one heat symptoms. 2. Osteoarthritis: degenerative changes in the knee joint cause damage to the articular cartilage, degeneration, sclerosis, hyperplasia and other lesions, the symptoms can also appear after the kneecap is cold. 3. Synovitis: Inflammation of the synovial membrane of the joints due to infection, immunity and other factors, such as rheumatoid arthritis, rheumatoid arthritis, etc., accompanied by swelling of the knee joints, increased skin temperature, joint effusion, restricted movement and other symptoms. Knee bone cold pain a heat on the good there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.