Bleeding Gums: Why They Bleed and What to Do

Why gums bleed

Healthy gums are pink and firm and do not bleed when you brush or floss. When plaque, the sticky film of bacteria on teeth, sits along the gumline for more than a day or two, the gums react with inflammation. Blood vessels in the gum widen and become fragile, so the slightest pressure makes them bleed. This is gum disease at its earliest stage.

If the gums look healthy but still bleed, or bleed for a long time, the problem may be with blood clotting rather than the gums. Platelets and clotting proteins seal small vessels within minutes. If either is low or blocked by a medicine, the gums are often one of the first places bleeding shows.

Common dental causes of bleeding gums

Gingivitis

Gingivitis is inflammation of the gums caused by plaque. Signs include red, puffy gums that bleed when brushing or flossing, and sometimes bad breath. It is painless, which is why people ignore it. It is completely reversible with good oral hygiene and a professional cleaning.

Periodontitis

Untreated gingivitis can progress to periodontitis, where infection destroys the ligament and bone holding the teeth. Signs include receding gums, pockets between gums and teeth, persistent bad breath, pus, and teeth that loosen or shift. The bone loss cannot be fully reversed, but treatment stops it progressing.

Brushing and flossing habits

Starting a new flossing routine often causes bleeding for a week or two, which stops as the gums heal. Brushing hard with a stiff brush can damage gums. Dentures, braces or a rough filling edge can rub and irritate the gums.

Hormonal changes

Pregnancy gingivitis affects many pregnant women, usually from the second month, because hormones increase the gums' response to plaque. Puberty, the menstrual cycle and oral contraceptives can have similar effects.

Systemic causes of gum bleeding

These are the main whole-body conditions that cause gums to bleed.

Medicines

• Blood thinners: warfarin, apixaban, rivaroxaban, dabigatran and heparin.
• Antiplatelet medicines: aspirin and clopidogrel.
• NSAIDs such as ibuprofen, especially at high doses.
• Medicines that cause gum overgrowth: phenytoin, cyclosporine and calcium-channel blockers such as nifedipine. Overgrown gums trap plaque and bleed.
• Chemotherapy: lowers platelet counts and causes mouth sores.

Do not stop a prescribed blood thinner yourself because your gums bleed. Speak to your doctor.

Low platelets and blood disorders

• Thrombocytopenia: a low platelet count, from immune thrombocytopenia (ITP), viral infections, liver disease, heavy alcohol use or medicines. Look for petechiae and easy bruising.
• Von Willebrand disease: the most common inherited bleeding disorder. Clues are lifelong nosebleeds, heavy periods and bleeding after dental work.
• Hemophilia: an inherited lack of clotting factor VIII or IX, mostly in males.
• Liver disease: the liver makes clotting factors, so cirrhosis causes bleeding gums and bruising.

Leukemia

Leukemia crowds out healthy blood cells. Bleeding gums together with fatigue, pale skin, fevers, frequent infections, easy bruising and bone pain is a classic pattern. In some types, especially acute myeloid leukemia, leukemia cells infiltrate the gums and make them swollen and spongy. This combination needs a blood count within days.

Vitamin deficiencies

• Scurvy (vitamin C deficiency): swollen, purple, spongy gums that bleed easily, with fatigue, joint pain, bruising and corkscrew hairs. It still occurs with very restricted diets, alcohol use disorder and some eating disorders.
• Vitamin K deficiency: from malabsorption, long antibiotic courses or certain medicines. It reduces clotting factor production.

Diabetes

Poorly controlled diabetes raises the risk of gum infection and slows healing, and gum disease in turn makes blood sugar harder to control. Bleeding gums with thirst, frequent urination and weight loss warrant a blood sugar test.

Other causes

Smoking hides gum bleeding by narrowing blood vessels, so smokers can have advanced gum disease with little bleeding. HIV and other causes of a weakened immune system increase the risk of severe gum infections.

Bleeding gums and fatigue

Fatigue with bleeding gums suggests a systemic cause rather than plaque alone. Possible explanations include:

A complete blood count is the first test.

How the cause is found

A dentist will look at the gums, measure pocket depths around each tooth, and may take X-rays to check bone levels. They will ask about your medicines, smoking and medical conditions.

If the gums look healthier than the amount of bleeding suggests, or you have other symptoms, your doctor may order:

• complete blood count (platelets, red and white cells)
• clotting tests (PT/INR and aPTT), and von Willebrand factor testing
• liver function tests
• blood glucose or HbA1c
• vitamin C level in suspected scurvy

How to stop bleeding gums

At home

• Brush twice a day for 2 minutes with a soft-bristled brush and fluoride toothpaste, angling bristles toward the gumline.
• Clean between teeth once a day with floss, interdental brushes or a water flosser. Keep going even if the gums bleed at first.
• An antiseptic mouthwash can help reduce plaque.
• Stop smoking.
• Eat fruit and vegetables daily for vitamin C.
• For active bleeding, press a clean, damp gauze or a cold, wet tea bag firmly on the area for 10 to 15 minutes.

Dental treatment

• Professional cleaning removes hardened plaque (tartar) that brushing cannot.
• Scaling and root planing (deep cleaning) for periodontitis, sometimes with antibiotic gels.
• Gum surgery for advanced disease.

Medical treatment

Treatment of a systemic cause stops the bleeding: adjusting blood thinners, treating ITP, vitamin replacement, controlling diabetes or treating leukemia.

Frequently asked questions

What is the most common cause of bleeding gums?

Gingivitis, inflammation from plaque left along the gumline, causes most bleeding gums. It is painless and reversible. Brushing twice a day, flossing daily and a professional cleaning usually stop the bleeding within about 2 weeks.

What systemic issues cause gum bleeding?

Whole-body causes include blood-thinning medicines, low platelets (thrombocytopenia or ITP), inherited bleeding disorders such as von Willebrand disease and hemophilia, leukemia, liver disease, vitamin C or K deficiency, uncontrolled diabetes, pregnancy hormones and chemotherapy.

Can bleeding gums and fatigue be a sign of leukemia?

They can be. Leukemia often causes bleeding gums, tiredness, pale skin, fever, infections and easy bruising together. Most people with bleeding gums do not have leukemia, but this combination needs a prompt blood count from your doctor.

Should I stop flossing if my gums bleed?

No. Bleeding is a sign the gums are inflamed, and gentle daily flossing removes the plaque causing it. Bleeding usually stops within 1 to 2 weeks. If it continues beyond that despite good cleaning, see your dentist.

Can a vitamin deficiency cause bleeding gums?

Yes. Vitamin C deficiency (scurvy) causes swollen, spongy, bleeding gums, and vitamin K deficiency reduces clotting. Both are uncommon with a normal diet but occur with very restricted eating, alcohol use disorder, malabsorption or long antibiotic courses.

Are bleeding gums in pregnancy normal?

They are common. Pregnancy hormones make the gums react more strongly to plaque, causing pregnancy gingivitis. Keep brushing and flossing and see your dentist, since dental cleanings are safe in pregnancy and untreated gum disease is linked to pregnancy complications.