Why does my mouth randomly bleed

Unexpected mouth bleeding most often comes from inflamed gums, but a wound, infection, medication, or systemic issue can also contribute.

Gingivitis makes gum tissue swollen and prone to bleeding when plaque collects along the gumline. Blood can also come from a sharp food injury, biting the cheek, a loose tooth, an ulcer, or irritation from a toothbrush or appliance.

Rinse gently with water, note where the blood started, and inspect for a cut without poking the area. Continue careful brushing with a soft brush around the gumline, but do not scrub a painful wound or place aspirin directly on tissue.

Seek urgent help for heavy bleeding, bleeding after an injury, facial swelling, trouble breathing, faintness, or bleeding that will not stop with firm pressure. Book dental care when episodes recur, gums are swollen, or bleeding comes with pain, pus, loose teeth, or fever.

Tell the dentist when the bleeding began, whether brushing triggered it, and which medicines or supplements you take. Ask for a gum examination, plaque and calculus assessment, and any imaging or medical referral needed for the pattern you describe.