Blood in phlegm after a nosebleed

After a nosebleed, blood can move backwards from the nose and be spat out later as a clot or dark-streaked phlegm. Dry air, nose rubbing, Allergic Rhinitis, a Common Cold, or Sinusitis can make the nasal lining easier to irritate. Hypertension may be relevant when nosebleeds are recurrent, but a single episode does not establish a cause. Blood that appears without any nose or throat symptoms, is repeatedly coughed up, or seems to come from deep in the chest needs a clinician to assess.

Sit upright and lean slightly forward if the nose starts bleeding again; pinch the soft part of the nose continuously while breathing through your mouth. Spit out blood rather than repeatedly swallowing it. Avoid forceful nose blowing, picking, heavy exertion, and hot drinks for a while after bleeding settles. Use gentle nasal care and arrange review if episodes recur. Note how long the nosebleed lasted and whether the blood in phlegm followed immediately or later.

Seek urgent help if the nosebleed will not stop with firm pressure, blood is flowing heavily into the throat, or you feel faint or weak. Get emergency help for trouble breathing, chest pain, confusion, or coughing up blood that is not explained by the nosebleed. Prompt assessment is sensible if you take blood-thinning medicine, have repeated episodes, or develop fever and facial swelling.

Does the blood appear to be from my nose or lower airways? Could dryness, allergy, sinus symptoms, or medicine be contributing? How should I manage another nosebleed and when should I attend urgently?