Haemoptysis (coughing blood)

Haemoptysis means coughing up blood or blood-streaked sputum from the lungs or airways. It ranges from small streaks of blood in phlegm to large-volume bleeding, which is a medical emergency. The underlying cause can range from a minor chest infection to a more serious lung condition.

Common causes include chest infections and bronchitis, but it can also result from more serious conditions such as pneumonia, bronchiectasis, tuberculosis, blood clots in the lung, or lung cancer. Some medications, particularly blood thinners, can also increase the risk of visible bleeding with a cough. The likely cause depends heavily on associated symptoms, smoking history, and other risk factors.

Concerning associated features include coughing up large amounts of blood, breathlessness, chest pain, unexplained weight loss, night sweats, or a persistent cough lasting more than a few weeks. Fever alongside blood-streaked sputum can suggest an infection. Any of these features, alongside the bleeding itself, warrants prompt medical assessment.

It can range from a minor issue, such as a small streak from a chest infection, to a sign of a serious underlying condition or, in cases of large-volume bleeding, an immediate emergency that can compromise breathing. Any new episode of coughing up blood should be assessed by a doctor, even if it seems minor, to identify the cause. Large amounts of blood, or bleeding with breathlessness, needs emergency care.

Investigation typically includes a chest X-ray or CT scan, blood tests, and sometimes bronchoscopy (a camera examination of the airways) to identify the source and cause of bleeding. Your doctor will also ask about smoking history, recent infections, and other risk factors to guide investigation. Results guide the specific treatment needed for the underlying cause.

Treatment depends entirely on the underlying cause: antibiotics for an infection, blood thinners adjustment if medication-related, or more specific treatment such as targeted therapy for a blood clot or cancer treatment where relevant. Bleeding itself may need specific management, such as bronchial artery embolisation, in more significant cases. Addressing the underlying cause is central to preventing recurrence.

Yes, coughing up blood can be an early or presenting symptom of lung cancer, particularly in smokers or ex-smokers, though many cases of haemoptysis have a benign cause such as infection. Because lung cancer is an important possibility to exclude, especially in at-risk groups, imaging investigation is usually recommended for any unexplained haemoptysis. Early investigation gives the best chance of catching a serious cause while still very treatable.

True haemoptysis comes from coughing and originates from the lungs or airways, often mixed with sputum and sometimes frothy, whereas bleeding from the nose, throat, or gums is usually swallowed or spat out rather than coughed up, and can sometimes be mistaken for haemoptysis. A doctor’s assessment, including examination of the nose and throat, can usually help clarify the true source of bleeding. This distinction matters because the investigation and treatment needed differ significantly.

Seek emergency care for coughing up a large amount of blood, breathlessness, chest pain, or feeling faint, as this can indicate a serious or life-threatening cause. For smaller amounts of blood-streaked sputum without these alarming features, a prompt GP or private respiratory assessment, often available within about a week, is appropriate to investigate the cause. Any new haemoptysis, even if small in volume, should not be ignored and warrants medical review.