Swollen feet can be caused by the following reasons: first, gout, gout is the most common cause of swollen feet, and is also the most commonly involved parts of gout, when there can be swelling of the joints of the feet, which can be accompanied by pain and redness of the skin and increased skin temperature, then the blood uric acid should be checked and X-rays and CT of the feet should be taken for diagnosis and early treatment. Second, infectious diseases, when the foot has bacterial infection or tuberculosis infection, there can be swelling of the foot, can be accompanied by pain, can also have elevated skin temperature, serious cases will have the formation of sinus tracts or abscess formation, then we should test blood uric acid and take X-rays of the foot, do blood tests, foot MRI to diagnose and early treatment.