Leg swelling in the elderly can be caused by local soft tissue lesions, vascular diseases, cardiogenic diseases, renal diseases, liver diseases, metabolic diseases, parasitic diseases, etc. It is recommended to consult a doctor in time. 1. Local soft tissue lesions: such as acute cellulitis, soft tissue contusion, intradermal hematoma, muscle hematoma, etc., the affected area is often accompanied by obvious pressure pain. 2. Diseases of the vascular system: such as varicose veins of the great saphenous veins, phlebitis, venous thrombosis, venous occlusive disease, etc., the patient may also be accompanied by redness, swelling, pain and other discomforts in the area of the vascular route. 3. Diseases of cardiac origin: such as pulmonary heart disease, cardiac valvular disease, heart failure, cardiomyopathy, pericardial effusion, etc., patients may also be accompanied by chest tightness, palpitation, chest pain, fatigue, decreased physical strength and other discomforts. 4. Renal diseases: such as glomerulonephritis, pyelonephritis, etc., patients may also be accompanied by lumbar pain, proteinuria, hematuria and other discomforts. 5. Hepatogenic diseases: such as hepatitis, cirrhosis of the liver, etc., patients may also be accompanied by loss of appetite, jaundice, malnutrition, bleeding and other discomforts. 6. Metabolic diseases: such as diabetes mellitus, malnutritional hypoproteinemia, etc., which can also induce swelling of the lower limbs. 7. Parasitic diseases: such as filariasis, schistosomiasis, schistosomiasis, etc., the patient may also be accompanied by lymph node swelling and pain, fever, fatigue, muscle and joint pain and other discomforts. Older people with symptoms of leg swelling, persistent unrelieved or accompanied by other discomforts, should consult a doctor in a timely manner, under the guidance of the doctor to identify the cause of the disease, and if necessary, the appropriate treatment.