There are many causes of foot swelling and pain, which may be caused by trauma or overstrain, or by disease factors, such as rheumatic and immune diseases, foot soft tissue infections, lower limb vascular diseases, abnormal organ functions, etc.: 1. Trauma or overstrain: violent impact, long time wearing high heels or shoes that do not fit, etc., causing obvious soft tissue damage or bone damage, can cause foot swelling and pain; 2. Immune diseases: such as rheumatoid arthritis, gouty arthritis, inflammation erosion of bone tissue, can cause obvious joint swelling, pain, can be manifested as foot discomfort; 3, foot soft tissue infection: usually bacterial infection, resulting in obvious symptoms of redness, swelling, heat and pain in the foot; 4, lower limb vascular disease: such as varicose veins of the lower limbs, lower limb arterial occlusive disease, lower limb venous valve closure insufficiency Lower limb artery thrombosis, etc., can cause obstruction of blood return to the lower limbs, resulting in swelling and pain in the feet; 5, abnormal organ function: liver, kidney, thyroid and heart and other organ function diseases, such as hypoalbuminemia, hypothyroidism, heart failure, etc., in addition, the possibility of tumor diseases of the feet is not excluded.