Varicose veins are superficial veins that are tortuous and dilated due to factors such as blood stagnation and weakness of the vein walls. Varicose veins can occur in several parts of the body. The most common site for varicose veins is the lower extremities. It is important to emphasize that varicose veins themselves may be a secondary manifestation of other pathologies, such as vena cava occlusion, and the primary pathology should be actively addressed. The hazards of varicose veins include: 1, varicose veins mainly manifest as soreness and heaviness in the affected limbs, which affects the normal life and emotions of patients. 2.The lighter ones show the red blood and small blue reticular veins, and the heavier ones show the tortuous expansion of striped veins, which affects the beauty of legs. 3, if not timely treatment, further development, can appear skin pigmentation, with itching, skin roughness, flaking, atrophy, can also lead to thrombotic superficial phlebitis, old rotten leg. 4, varicose veins rupture and bleed. Most of them occur in the foot and ankle area, which can be manifested as subcutaneous bruising or external bleeding when the skin breaks down. 5.Seriously, it can also cause deep vein or superficial vein thrombosis of lower limbs. Deep vein thrombosis of the lower extremities has the risk of causing pulmonary embolism, and pulmonary infarction is life-threatening. Although superficial varicose veins are not too dangerous, but if deep vein thrombosis occurs, it is still more dangerous, so it is advisable to treat them as early as possible and seek medical attention in time.