Oral bleeding may be caused by a variety of reasons, if oral bleeding occurs, you should promptly visit the hospital for examination and symptomatic treatment. According to different reasons for treatment, the causes of oral bleeding include gum bleeding, tooth bleeding, oral mucosa bleeding, etc., as follows: 1, gum bleeding: may be caused by gingivitis, periodontitis, which requires systematic periodontal treatment, full mouth cleaning, scraping, etc., and even serious surgical procedures, root surface leveling, and regular review, regular full mouth cleaning, to keep the oral environment clean. 2, tooth bleeding: may be caused by pulp exposure or chronic bleeding. 2, teeth bleeding: it may be caused by pulp exposure or chronic hyperplastic pulpitis, which requires endodontic treatment of teeth. 3, oral mucosa bleeding: such as bleeding of buccal mucosa and lingual mucosa caused by trauma, should be immediately seen in the hospital and stitched.