Swelling on both sides of the ankle can be caused by the following reasons: first, synovitis, synovitis can lead to chronic inflammation of the synovial membrane, and the joint cavity fluid, which can lead to swelling on both sides of the ankle joint, then early examination and examination of the MRI and ultrasound of the ankle joint to diagnose and early treatment. Second, rheumatoid diseases, when rheumatoid involves the ankle, there can be bilateral ankle swelling, often symmetrical onset, there can be morning stiffness, and in serious cases, there will be ankle deformity, then blood tests and ankle X-ray, MRI to diagnose and treat. Thirdly, patients with osteoarthrosis and osteoarthritis can have swelling on both sides of the ankle, which can lead to pain in the ankle joint and deformity of the ankle joint due to the formation of a large amount of bone redundancy.