The swollen feet after the drip may be due to localized ooze, cardiac and renal insufficiency, and poor venous return in the lower limbs. 1. Localized oozing: IV is intravenous fluid therapy. If the infusion is carried out in the foot, and there is a situation of needle removal or fluid extravasation, then swelling of the foot will occur. Need to change the injection site, hot compresses to promote fluid absorption. 2. Cardiac and renal insufficiency: patients with cardiopulmonary insufficiency, if the infusion of too much fluid, it will lead to swelling of the ankle. Patients with chronic renal insufficiency are prone to sodium and water retention during fluid infusion, leading to edema in the lower extremity area. 3. Poor venous return in the lower limbs: blood stasis and swelling of the feet can also occur after infusion. Other diseases such as the body in the metabolic function is reduced, endocrine disorders, microcirculation function is reduced state, also easy to cause foot swelling, need to target the original disease treatment. If the symptoms of swollen feet are not serious, it can be relieved by diuresis and sodium, and it is also recommended to check the patient’s cardiac and renal functions, and then further treatment according to the test results.