What should you know about coughed up some blood?

Blood mixed with mucus can arise when forceful coughing irritates the throat or bronchial tubes. Chest infections such as pneumonia may inflame small airways, while bronchiectasis can make damaged airways bleed during a flare. Less commonly, a clot affecting the lungs, tuberculosis, or lung cancer can present with coughing up blood. A blood-stained mouth or nose can also be mistaken for blood from the lungs.

The amount, colour, timing, and accompanying symptoms help a clinician judge the cause. This symptom does not by itself identify one condition.

Arrange prompt medical advice, even if the amount seems small or the bleeding has stopped. Note whether the blood was streaked through mucus or brought up separately, how often it occurred, and whether you have fever, breathlessness, chest discomfort, weight loss, or night sweats. Bring a list of medicines, particularly blood thinners, and avoid smoking while waiting for advice.

Seek emergency help if bleeding is more than a trace, keeps coming, or occurs with severe breathlessness, chest pain, faintness, confusion, blue lips, or a fast heartbeat. Do not drive yourself if you feel weak or short of breath. A sudden sharp chest pain with breathlessness needs urgent assessment because pulmonary embolism can be life-threatening.

Ask what examination or imaging may be needed, whether a chest infection is possible, how your medicines affect bleeding, and which changes should prompt emergency care. If cancer treatment is already part of your care, ask whether palliative radiotherapy could help symptoms caused by a lung tumour.