Swollen feet without depression are mainly caused by gouty arthritis, trauma, diabetic foot and local infectious lesions. 1. Gouty arthritis: accompanied by local redness of the skin, skin temperature rise, etc. Swelling is mostly seen after eating seafood and animal offal and other high-purine diets, and most of the patients have significantly elevated uric acid in hematological examination. 2. Trauma: such as local soft tissue injury and foot fracture, etc., there is a history of trauma, accompanied by localized obvious pain, and the pain will be aggravated after the foot is stressed, and the pain will be alleviated after elevation and braking. 3. Diabetic foot: history of diabetes mellitus, sometimes accompanied by localized ulceration and reddening of the skin, etc., mostly caused by prolonged poor glycemic control, but some of them have significant stenosis of lower extremity blood vessels or embolism. 4. Foot infections: such as cellulitis or purulent infections, accompanied by local elevated skin temperature, pain, redness, etc., need to be differentiated from gout. Swollen feet without depression may also be caused by physiological factors, such as excessive standing, resulting in lower limb blood circulation disorders caused by rest can be significantly relieved or disappear. It is recommended to consult the hospital for clarification and treatment.