There are many causes of leg edema every day, such as the more common varicose veins in the lower extremities, and postural edema caused by poor venous return due to prolonged standing, and also kidney diseases, such as glomerulonephritis. Lower limb edema can also occur due to imbalance of sodium metabolism, and lower limb edema is often seen in heart failure and coronary heart disease. In addition, endocrine causes, such as mucinous edema caused by hypothyroidism, or drug-induced, such as the use of licorice, hormonal drugs, and insulin injections in diabetic patients may cause drug-induced edema. After the appearance of edema, it is recommended to go to the hospital for detailed examination to clarify the cause, and then targeted treatment.