Varicose veins are generally referred to as phlebitis, blockage of blood vessels, venous thrombosis and other conditions. 1. Phlebitis: Phlebitis is an aseptic disease of the venous blood vessels, which is usually caused by drug stimulation and pathogen infection. It usually results in localized redness, swelling and pain, which leads to stagnation of blood in the limbs, and the appearance of varicose vein depression. 2. Clogging of blood vessels: Clogging of blood vessels means narrowing or blocking of blood vessels, usually due to arteriosclerosis of blood vessels, which leads to absorption of blood in the venous vessels, resulting in concave varicose veins. 3. Venous thrombosis: Venous thrombosis refers to the formation of hard lumps of red blood cells, platelets, etc. in the veins, which is generally caused by slow blood flow, damage to blood vessels, etc., and can lead to varicose veins concave. Patients are advised to go to the hospital for timely examination and symptomatic treatment under the guidance of the doctor.