The risk of swollen feet and legs due to heart failure should be evaluated specifically. Heart failure is a sign or symptom that appears after the heart function has progressed to the end stage. Usually, most patients with heart failure may have swollen legs, swollen feet, dyspnea, weakness, poor appetite and poor digestion. Patients with heart failure are at greater risk if they develop generalized swelling, symptoms of malignant arrhythmia or embolism. If the leg swelling occurs in simple heart failure without significant post-activity shortness of breath, the patient’s leg swelling can be reduced by medication adjustment and diuretic adjustment to slow down the further progression of heart failure. Therefore, milder heart failure can be controlled by diuretics. It is necessary to pay attention to small amounts of water combined with diuretics to increase water excretion, and patients need to pay attention to electrolyte balance, which can effectively correct leg swelling and heart failure and facilitate patients’ treatment at home.