Tongue oozing blood but no pain first need to be alert to thrombocytopenia caused by, may also be caused by vitamin deficiency and so on. 1. Thrombocytopenia: thrombocytopenia can cause coagulation disorders, bleeding from the oral mucosa or blood seepage from the tongue, etc. It is recommended to consult a doctor in a timely manner to check for blood system disorders, and if you suffer from leukemia, your tongue will seep blood spontaneously. 2. Vitamin deficiency: Vitamin deficiency can be caused by malnutrition or gastrointestinal absorption disorders, and vitamin deficiency can lead to cracks on the surface of the tongue or lingual inflammation, which may lead to blood oozing from the tongue. There may be other reasons for the tongue to bleed but not hurt. It is recommended to go to the hospital to clarify the cause of the bleeding and to carry out diagnosis and treatment.