Whether a black blood blister on the tongue is serious or not should be determined on a case-by-case basis and should not be generalized. Blood blisters on the tongue may be caused by traumatic reasons, such as careless chewing or eating too hard or too hot food, or there may be hemangiomas. Patients can go to the hospital and have the blood blisters removed under the operation of a professional doctor, and then local medication can be used to disinfect them, which is usually not serious. The medical operation for black blood blisters is not complicated, but if delayed, the blood blisters near the throat may grow and affect breathing, causing the risk of suffocation, which is more serious and should be treated as soon as possible. In addition, blood blisters on the tongue may also be caused by scraping of sharp tooth tips or root remnants, and need to be actively addressed if there are root remnants or dental caries in the mouth. Patients need to be aware that the presence of black blood blisters on the tongue, which can easily cause infection when picked by themselves, is recommended to be treated in hospital to prevent the symptoms from being aggravated by improper operation.