Two black veins under the tongue are usually caused by qi stagnation and blood stasis, excessive dampness and other reasons.
1. Qi stagnation and blood stasis: long-term emotional depression, dietary disorders, or bruises, resulting in poor qi and blood operation, can appear under the tongue with two black veins, but also local pain, lumps, bleeding and other symptoms.
2. Excessive dampness: If there are factors such as excessive labor, dietary disorders, leading to excessive dampness in the body, there can also be two veins under the tongue is very black.
When there are two veins under the tongue is very black, continue to do not relieve, should consult a doctor in a timely manner, after a clear diagnosis and active treatment.