The causes of swollen feet in men are mainly categorized into whether it is one foot that is swollen or two feet that are swollen. If one foot is swollen, it may be due to varicose veins that cause obstruction of venous blood return, high pressure in the veins, stagnation of blood in the veins, and blood infiltration into the subcutaneous tissues that cause swelling of the feet. It can also be due to deep vein thrombosis, which can cause obstruction of venous return, and likewise high pressure in the veins, and blood can penetrate through the walls of the blood vessels into the subcutaneous tissues causing swelling of the feet. It may be due to bilateral swelling of the feet, such as men with heart failure, liver failure, renal failure, or pulmonary hypertension, right heart insufficiency, etc., may lead to the body’s sodium and water retention, hypo-proteinemia, which will make the blood vessel blood infiltration into the subcutaneous tissues, such as the human body’s feet in the lowest position, so it is most likely to be the case of swelling of the feet. Men with swollen feet must go to the hospital for detailed diagnosis and treatment.