The so-called "blue veins" are the veins visible under the skin of the human body (blood vessels that send blood back to the heart). Experts believe that the blue veins stand out suddenly, indicating that phlegm, dampness, rash and poison have accumulated in the human body. At this time, the venous blood return will be blocked, the pressure will increase, and the veins will appear on the surface of the human body, such as lumps, varicose veins and discoloration.

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Huangdi Neijing said: "Meridian can adjust the deficiency and excess, so it is indispensable." Therefore, the prominent blue veins are the manifestation of sub-health of human body, and even cause serious diseases. For example, the blue veins on the hand, if on the back of the hand, suggest that the back is stagnant, common backache; If there are veins standing out on your fingers, it means gastrointestinal stagnation and indigestion, and adults also reflect insufficient blood supply to the cerebral vessels; If the veins in the palm of your hand are blue, it also means that the gastrointestinal tract is stagnant, the blood is thick, the blood pressure is high and the body is weak.