Blood Disorders and Oral Signs
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Direct answer
Before the haemogram is ordered, the mouth has often already announced the blood disorder: pallor of the mucosa in anaemia, a smooth sore tongue in deficiency states, spontaneous gingival bleeding in thrombocytopenia, boggy gingival enlargement infiltrated with blasts in leukaemia, and prolonged post-extraction ooze in haemophilia. Iron-deficiency anaemia adds angular cheilitis and, with oesophageal webs, the Plummer-Vinson syndrome that predisposes to carcinoma; the haemoglobinopathies of the Indian carrier belt — thalassaemia and sickle cell disease — reshape the jaws and skull. The dentist's task is recognition before treatment, because scaling or extraction in an undiagnosed bleeding disorder or active leukaemia can be the first medical catastrophe of the disease.
What you must remember
- Iron-deficiency anaemia: mucosal pallor, angular cheilitis, atrophic glossitis and aphthous-type ulceration; the Plummer-Vinson (Paterson-Kelly) triad of iron deficiency, dysphagia and oesophageal webs carries a risk of post-cricoid carcinoma.
- Megaloblastic anaemia (B12 and folate): a beefy-red, sore, smooth tongue — Hunter's glossitis — with possible paraesthesia; pernicious anaemia adds autoimmune gastritis.
- Thalassaemia major: marrow hyperplasia expands the maxilla ("chipmunk" facies), causing malocclusion, spaced teeth and a hair-on-end skull radiograph; India carries millions of carriers, making prenatal screening counselling part of the picture.
- Sickle cell disease, endemic in central India's tribal belt, produces bone infarcts, mandibular osteomyelitis and a similar hair-on-end skull.
- Leukaemia: acute lymphoblastic leukaemia is the commonest childhood malignancy; oral signs — gingival enlargement with haemorrhage (classically of the monocytic AML subtypes M4 and M5), petechiae and ecchymoses, mucosal ulcers from neutropenia, and loose teeth from marrow infiltration — may be the presenting feature.
- Agranulocytosis, including drug-induced (carbamazepine, given for trigeminal neuralgia, is the dental favourite), presents with sharply painful ulcers and minimal erythema because neutrophils are absent to mount redness.
- Thrombocytopenia (immune thrombocytopenic purpura): petechiae of the palate, spontaneous gingival bleeding and post-surgical ooze; counts below roughly 20,000 per microlitre risk spontaneous bleeding and need haematology before any surgery.
- Haemophilia A (factor VIII, X-linked) and B (factor IX): prolonged deep bleeding after extraction or block anaesthesia; partial thromboplastin time prolonged with normal prothrombin time and platelets; management is factor cover with tranexamic acid mouth rinses, and inferior alveolar blocks avoided without cover.
- Elective dentistry in leukaemia waits for remission with adequate neutrophil and platelet counts; multiple myeloma adds the numb chin and punched-out jaw radiolucencies.
The bleeding gum ladder
Work any bleeding gum in three rungs. Rung one, local: is this plaque-induced gingivitis with a clear deposit interface, bleeding only on provocation, in an otherwise well patient? Then it is dental disease. Rung two, the platelet question: spontaneous bleeding, petechiae on the palate or soft palate, bruising out of proportion to brushing — order a platelet count and a complete blood picture; the smear may surprise you with blasts. Rung three, the coagulation question: deep, delayed bleeding into spaces — after extraction, or with a block injection — pointing to factor deficiency; check prothrombin time, partial thromboplastin time and take a family bleeding history before any surgery. The same discipline reads the other sign: a young patient with diffuse, pale-pink, boggy gingival enlargement, no drug history and pallor gets a blood count the same day, because leukaemic infiltrate sits under that swelling, and scaling it will not reduce it one millimetre.
Gingival swelling with no drug history
The exam scenario that repeats every year: a 22-year-old with rapid generalized gingival enlargement, spontaneous bleeding, pallor and low-grade fever. The candidate who answers "phenytoin overgrowth" loses the mark — there is no epilepsy, no transplant, no calcium-channel blocker; the tempo is wrong and the pallor is the clue. Leukaemic infiltration, most often of the monocytic acute myeloid subtypes, is the diagnosis, and the sequence is physician-to-physician referral, urgent complete blood count, and no elective periodontal surgery until the haematologist clears counts. The teaching generalizes: drug overgrowth is a diagnosis of the drugged; in everyone else, the blood comes first.
Frequently asked questions
Which anaemia is associated with post-cricoid carcinoma risk?
Iron-deficiency anaemia with dysphagia and oesophageal webs — the Plummer-Vinson or Paterson-Kelly syndrome.
Which leukaemia subtypes show marked gingival enlargement?
Acute myeloid leukaemia with monocytic differentiation (classically French-American-British subtypes M4 and M5), whose blasts infiltrate the gingival corium.
Why do agranulocytosis ulcers show little redness?
Because the neutrophils that generate the inflammatory flush are absent — deep, necrotic, painful ulcers with minimal surrounding erythema are the signature.
What dental precautions apply in haemophilia?
Factor replacement cover before surgery, avoidance of intramuscular and inferior alveolar block injections without cover, atraumatic technique and antifibrinolytics such as tranexamic acid.
Which jaw changes occur in thalassaemia major?
Maxillary marrow hyperplasia with protrusion, spacing and malocclusion ("rodent" or chipmunk facies) and hair-on-end skull radiographic appearance; delayed eruption contributes.
What is the significance of a numb chin with jaw radiolucencies?
It suggests mandibular marrow infiltration — classically multiple myeloma or metastatic disease — and warrants urgent imaging and haematological workup.