Swollen and painful feet and necks can be caused by the following reasons: first, rheumatoid diseases, when rheumatoid involves the joints, there can be swelling and pain in the ankle, and in serious cases, there can be deformities. Second, gout, when gout involves the ankle joint, there can be swelling and pain in one or both ankle joints, accompanied by gout stone formation or elevated skin temperature, then it is necessary to test blood uric acid and take x-ray of the ankle joint for early diagnosis and treatment. Third, synovitis, when there is synovitis, there can be symptoms of swelling and pain in the neck of the foot, often due to cold or exertion, then it is necessary to check the foot x-ray, MRI for early diagnosis and early treatment. Fourth, severe osteoarthritis, severe osteoarthritis can be followed by synovitis, which can lead to swelling and pain in the ankle joint, and there can be a large number of bone redundancy formation and joint deformity, which should be diagnosed by early examination and ankle X-ray and CT.