What is the reason for swollen legs and feet?

The causes of swollen feet are as follows: Idiopathic swollen feet are more common in women. Symptoms often appear on both feet at the same time, to a mild degree. They often appear when standing for a long time or when you are tired. It may gradually disappear after lying down or resting. Functional foot swelling is more common in women, is generally not serious, often occurs intermittently, and generally lasts for several years. Some patients' foot swelling is related to the season, but has nothing to do with body position. The reason is still unknown. Nutritional swollen feet are caused by a lack of nutrients in the body due to eating less, reduced digestive function, or suffering from chronic diseases, thus causing swollen feet. At this time, patients are often accompanied by anemia and are prone to infectious diseases due to reduced immune function. Cardiogenic swollen feet are caused by reduced heart function, especially in patients with right heart insufficiency. Examination of the heart at this time may reveal pathological changes such as organic murmurs and cardiac enlargement. Inferior vena cava foot swelling is foot swelling caused by poor return of the inferior vena cava. One foot often swells first. This is caused by thrombosis in the inferior vena cava and compression of the inferior vena cava by tumors in the pelvis. Once swollen feet occur, you must go to the hospital for a comprehensive examination and strive to find out the cause and treat it in time.