Coughing up blood after a nosebleed

Blood from the back of the nose can trickle down the throat, especially while lying down. Clearing that blood may look like coughing up blood, and swallowing it can upset the stomach. Dry air, rubbing, a cold, allergic rhinitis or sinus irritation can make the nasal lining bleed more easily. High blood pressure may be relevant when nosebleeds are recurrent, severe or difficult to stop, but a nosebleed does not by itself explain every episode of blood with a cough.

Consider whether the blood was present before the nosebleed, whether it was mixed with phlegm, and whether you have chest symptoms. Blood coming from the lower airways can look different from blood draining from the nose, so uncertainty is a reason to seek advice.

Sit upright, lean slightly forward, and pinch the soft part of the nose continuously while breathing through your mouth. Spit out blood rather than repeatedly swallowing it. Once bleeding stops, avoid nose picking, forceful nose blowing and strenuous activity for a while. Keep a note of medicines, including products that affect clotting, and arrange medical advice if bleeding repeats, the source is unclear, or coughing continues.

Get emergency help if you cannot breathe comfortably, feel faint, have chest pain, cough up ongoing or increasing blood, or cannot control the nosebleed with steady pressure. Seek prompt assessment if blood appears without a nosebleed, you develop fever or marked weakness, or the episode keeps returning. Do not lie flat while actively bleeding, and do not drive if light-headed.

Ask whether the blood most likely came from the nose or chest, whether your nasal lining or sinuses need treatment, and whether your blood pressure or medicines should be checked. Describe the sequence clearly: nosebleed first, throat drainage, then coughing, or blood appearing before the nosebleed.