Blood disorders in the mouth: leukaemia, anaemia and bleeding
- Mouth and systemic disease
Gums that bleed for no reason, petechiae on the palate or a pale sore tongue can point to leukaemia, low platelets, a clotting disorder or anaemia.
What it is
The mouth often shows the first signs of blood disorders. In acute leukaemia, gums may swell from infiltration, bleed spontaneously and ulcerate, and infections such as candidiasis and herpes become severe. Thrombocytopenia causes petechiae on the palate and buccal mucosa, blood blisters and gum oozing. Inherited clotting disorders (von Willebrand disease, haemophilia) may appear as prolonged bleeding after extractions or tooth eruption. Neutropenia causes recurrent ulcers and aggressive periodontitis. Anaemia causes pale mucosa, a smooth sore tongue, angular cheilitis and burning.
Oral findings
- Leukaemia: gingival swelling, spontaneous bleeding, ulcers, infections.
- Thrombocytopenia: palatal petechiae, blood blisters, oozing gums.
- Clotting factor disorders: delayed or prolonged bleeding after extraction.
- Neutropenia: recurrent ulcers, severe periodontitis in the young.
- Anaemia: pale mucosa, atrophic glossitis, angular cheilitis.
What the doctor does
- A full blood count is the key test when oral bleeding, petechiae or gum swelling have no local explanation.
- Dental extractions in patients with bleeding disorders need planning with haematology and local haemostatic measures.
- Before chemotherapy or stem cell transplant, dental sources of infection should be treated.
Next step / Initial management
- Unexplained gum bleeding, petechiae, gum swelling or ulcers: full blood count and film the same day; refer urgently to haematology if abnormal.
- Bleeding after extraction or a family history of bleeding: coagulation studies and von Willebrand screening; refer to haematology.
- Before cancer treatment: refer to the dentist to remove sources of infection.
Test yourself
Think of the answer, then tap the question to see it.
What oral sign suggests thrombocytopenia?
Petechiae on the palate and buccal mucosa, blood blisters and oozing gums.
Which test should be done first for unexplained gingival swelling and bleeding?
A full blood count with a blood film.
Why are dental sources of infection treated before chemotherapy?
Because neutropenia during treatment can turn a dental infection into life-threatening sepsis.
Connections
In Pharmacology1
Educational content; it does not replace assessment by a dentist or doctor and is not a clinical instruction. For facial or neck swelling with difficulty swallowing or breathing, a knocked-out tooth or bleeding that will not stop, go to an emergency department at once.
Sources: Bleeding Disorders (StatPearls Publishing (NCBI Bookshelf), 2023); Oral Health Considerations for Patients With Systemic Disease (StatPearls Publishing (NCBI Bookshelf), 2025); Von Willebrand disease (MedlinePlus, US National Library of Medicine, 2026); Iron Deficiency and Microcytic Hypochromic Anemia (StatPearls Publishing (NCBI Bookshelf), 2024).
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Representative model, for educational purposes only.