Hemophilia is a condition in which the blood doesn't clot properly, causing the person to lose more blood than normal during injuries, says Mayo Clinic. This occurs throughout the body, not just the mouth. If a person bites his tongue, it bleeds excessively, which can interfere with breathing, states Hemophilia of Georgia. Most people with this issue need to take a factor concentrate and blood-clotting medications, such as Amicar. If the bleeding lasts too long, the patient needs to consult a doctor. Chewing slowly, avoiding gum chewing, and flossing daily can prevent some of these tongue bleeds.
Cancer can cause the tongue to bleed as well, especially cancers that directly affect the blood and cause easy bleeding, according to the American Cancer Society. For instance, a person with leukemia has fewer blood platelets, triggering bleeding by the merest irritation against the tongue, such as brushing or flossing. Chemotherapy can also cause ulcers to form on the tongue that bleed. A person with mouth cancer needs to avoid hot drinks and sharp foods, focusing instead on pureed fruits.Learn more about Pain & Symptoms