Vascular tortuosity mainly refers to the vascular tortuosity of veins, commonly found in the lower extremities, which is mainly caused by prolonged standing or sitting, which prevents the calves from functioning as a muscle pump, and blood stagnates in the veins of the lower extremities due to gravity, causing excessive pressure in the veins, which can lead to impaired valve function after a longer lesion process. Such a condition will make the vein wall gradually become tortuous and dilated under pressure, and this condition is usually called lower limb venous valve insufficiency or varicose veins, which is also the typical cause of varicose veins.