Lower limb edema in the elderly is commonly caused by kidney disease, cardiac hypoplasia, hypothyroidism, etc. It is usually treated with medication, please follow the doctor’s instructions. 1. Kidney disease: If proteinuria occurs, especially a large amount of proteinuria, as well as hypoproteinemia, it suggests that nephrotic syndrome may occur, leading to double lower extremity edema in the elderly, and even eyelid edema. Diuretics such as hydrochlorothiazide and furosemide can be used as prescribed by the doctor to improve edema symptoms by increasing urination. 2. Cardiac decompensation: If heart failure occurs, that is, the elderly have underlying cardiovascular diseases, such as coronary heart disease, cardiomyopathy, etc., swelling of the upper limbs and lower limbs may occur. Diuretics, such as torasemide and spironolactone, can also be prescribed to reduce edema and decrease the cardiac load. 3. Hypothyroidism: due to various reasons, the body’s thyroid hormone reduction, or thyroid hormone can not play the role of slow metabolism, may appear edema, i.e., mucous edema. The doctor may prescribe levothyroid hormone replacement therapy, due to the metabolism back to normal, edema will be reduced to a certain extent, or even disappeared. The above are only some of the common causes. If symptoms persist, consult a doctor for a definitive diagnosis and standardized treatment as prescribed by the doctor. The use of drugs must follow the doctor’s instructions, not blindly use their own drugs, so as not to cause adverse consequences.