The obvious blue veins under the tongue, Chinese medicine believes that there is usually blood stasis in the body, may also be due to cold, it is recommended to consult a doctor in a timely manner. In Chinese medicine, the blue veins under the tongue are called “sublingual veins”. This tongue symptom suggests that there is blood stasis in the body or the blood flow is stagnant. With the aggravation of blood stasis, the veins will become more and more obvious, and the color will gradually deepen to purple-black, and the veins will also become more obvious. If the veins underneath the tongue become black and blue and thicken, it suggests that there is serious blood stasis in the body, which must be regulated in time. If the veins under the tongue are obvious and the color is greenish-purple, it may also be due to cold. If the blue veins under the tongue are obvious, it is recommended to consult a doctor in time and give appropriate treatment and regulation after diagnosis through TCM to prevent the condition from worsening.