The cause of swollen feet needs to be determined first. If the edema is unilateral or localized, it may be caused by a local disease, such as atherosclerosis, which requires treatment to improve circulation, or venous dysfunction, which requires treatment to reduce vascular permeability, increase venous return, reduce venous stasis, and increase vascular elasticity. If there is no local factor, it needs to be determined whether it is cardiogenic, nephrogenic, hepatogenic or caused by hypothyroidism. All can usually be treated with diuretic and decongestant therapy such as hydrochlorothiazide, furosemide or torasemide. When edema occurs in the feet, diuretics are applied in symptomatic management. The more moderate diuretics are hydrochlorothiazide and the more potent diuretics are torasemide and furosemide. The above mentioned drugs should not be applied for too long, because taking them for too long can easily lead to hypokalemia. Hypokalemia is more dangerous and can easily cause malignant arrhythmia, leading to sudden death of the patient. When foot edema occurs, symptomatic treatment is only one of the minor aspects, the main thing is to deal with the cause of the disease, otherwise the edema will appear again. If it is caused by nephritis or nephrotic syndrome, blood pressure control, improvement of renal microcirculation, and hormone application are also needed for treatment. If the edema is caused by liver disease, it needs to be treated with liver protection, if it is caused by heart failure, it needs to be treated with improving heart function, and if it is caused by hypothyroidism, it needs to be treated with levothyroxine tablets.