Swollen legs and feet in the elderly also have more causes. First of all, we have to distinguish whether these swellings are unilateral or bilateral. If the swelling is unilateral, the first thing to look at is whether there is redness, swelling, heat and pain in the affected limb, these are inflammatory reactions, the most common one is dermatitis, which is usually caused by bacterial infection, such patients are often accompanied by more serious foot disease, and the swelling of the lower limbs is caused after the combination of bacterial infection. If there is no redness, swelling, heat and pain, but simple swelling, consider whether the problem is caused by venous blood circulation in the lower extremities, and then you can go to the hospital for venous ultrasound of the lower extremities to clarify the diagnosis. If the swelling is bilateral, consider whether there is renal insufficiency, cardiac insufficiency or hypoproteinemia due to the patient’s poor nutritional status, which can cause symmetrical swelling of both lower limbs.