The causes of swollen feet in middle-aged people are more causes, which can be divided into physiological and pathological. Physiological ones are caused by longer sitting time and longer standing time under normal circumstances, and can also lead to edema in the middle and late stages of pregnancy. The most common causes of pathological: 1, kidney problems, such as nephritis nephropathy, kidney disease caused by edema, accompanied by facial edema. 2, heart problems caused by edema, such as heart failure can cause edema. 3, liver lesions of poor blood return, can also cause edema. 4, lower limb vascular lesions, such as arterial thrombosis, phlebitis, poor blood return can also cause edema. 5, inflammation caused by, such as lower limb The most common cause of edema is allergy, which is accompanied by redness and itchiness. 8, men also have prostate enlargement that causes edema due to poor urination. The reason for the edema should be clarified and treated for the cause.