Veins are generally referred to as venous vessels. The appearance of venous blood vessels on the body surface in addition to fair skin, thinness, excessive exercise and other physiological reasons; can also be a symptom of certain diseases, such as jugular varicose veins, varicose veins of the lower limbs. 1. Physiological factors: Some people are born with thin body, fair skin, and after excessive exercise, there may be the phenomenon of veins bulging and veins appearing outside, which is a normal physiological phenomenon. 2. Jugular vein varicose: it is a sign caused by increased jugular venous pressure, mostly caused by right heart failure, pericardial disease and superior vena cava syndrome. The main manifestation is that when the human body is in sitting position or semi-recumbent position, the jugular veins are obviously filled and dilated, and the range significantly exceeds the normal level. 3. Varicose veins on the surface of the body: such as superficial venous dysfunction of the lower limbs leading to varicose veins of the lower limbs, mostly due to the structural abnormality of the vein wall and venous hypertension. The obstruction of portal venous return in cirrhosis can also lead to abdominal wall varicose veins. In the early stage, it may be asymptomatic, or it may be manifested as self-consciousness or being found that one side of the limb has raised veins in the form of earthworms, with or without symptoms of acidity and distension. If the veins appear in certain parts of the body and cannot be relieved on their own, you should go to the hospital in time and undergo the relevant hospital examinations to clarify the cause of the disease and actively cooperate with the doctor’s treatment.