Black blood vessels at the base of the tongue are generally a normal physiological phenomenon, but it may also be caused by tumors at the base of the tongue, inflammation at the base of the tongue and other reasons. 1. Physiological phenomenon: the blackening of blood vessels at the base of tongue root generally refers to the blackening of venous blood vessels, because the venous blood vessels are darker in color and black, if they are always black, this situation belongs to normal physiological phenomenon. 2. Melanoma: Melanoma is a kind of occupying lesion, most of which is malignant, and it will produce a lot of melanin, which enters into the tumor along with the blood circulation, and the tumor will gradually turn into black, and the patients will be manifested as the blackness of blood vessels at the base of the tongue, it is suggested that the melanoma patients should go to the hospital as soon as possible, and have the tumor resection under the guidance of the doctor. 3. Inflammation of tongue root: after inflammation of tongue root, white blood cells and other inflammatory factors will engulf each other, which may cause some melanin deposition, thus leading to black blood vessels at the base of tongue root. Cefdinir, amoxicillin and other drugs can be used as prescribed by the doctor. The blackening of blood vessels at the base of the tongue is recommended to go to the hospital in time and standardize the treatment under the doctor’s care.