Swollen legs and feet are seen in people who are obese and have heavy body weight, and may also have systemic arthritis, which increases the weight load on the whole body and puts a heavy load on the knee joint and lower limbs, causing swollen legs and feet and weakness. There are also some people who have a combination of venous thrombosis of the lower extremities, causing blockage of blood vessels, which may also cause weakness and swelling of the lower extremities. In addition, patients with severe edema, heavy gravity in the lower limbs, and swollen feet may use diuretic drugs intermittently, and long-term use of diuretics may cause low blood potassium, which may also cause weakness. Therefore, if you have swollen legs and feet and weakness, you should rest in bed and elevate the affected limbs. If you do not get relief within a short period of time, you must go to a regular hospital in time and choose a reasonable treatment method after the cause is clear.