A nosebleed during chemotherapy can be alarming. This is especially true for people being treated for cancers of the head and neck region, where the lining (mucosa) of the nose and throat is more directly affected by treatment, making nosebleeds somewhat more common. Most nosebleeds begin in the small, fragile blood vessels near the front of the nasal lining and can be triggered by dry air or only mild irritation.
Chemotherapy can temporarily reduce the bone marrow's ability to make platelets, the cells that help blood clot. When the platelet count falls, bleeding may start more easily and take longer to stop. Platelet counts often reach their lowest point about 7 to 14 days after a chemotherapy dose, so it can help to watch for nosebleeds, gum bleeding, or small bruises during that window.
If a nosebleed happens at home, stay calm and lean slightly forward. Tilting the head back is not advised, because blood can run down the throat and be swallowed. Pinch the soft part of the nose firmly between thumb and index finger and hold without releasing for 10 to 15 minutes. A cold, damp cloth over the bridge of the nose may also help. Once the bleeding stops, avoid blowing or picking the nose for several hours, and keep indoor air humid so the lining does not dry out.
Contact your treating hospital or go to the emergency room without delay if bleeding does not stop after 15 to 20 minutes of steady pressure, if the flow is heavy or returns frequently in a short time, if you also feel dizzy, sweaty, or notice a racing heartbeat, or if a fever around 38°C (100.4°F) appears. These signs may point to something beyond a simple nosebleed.
Reassuringly, a single nosebleed does not by itself mean danger. Still, be sure to tell your care team at the next visit or blood test that a nosebleed occurred, how long it lasted, and how often. They can check your platelet count and, if needed, advise on protecting the nasal lining or further steps.
This article is general information and does not replace individual medical care. Symptoms and treatment situations differ from person to person, so please discuss specific decisions and actions with your own care team.