Does lung cancer cause coughing up blood?

Blood may appear as streaks mixed with mucus or as more obvious red material. Lung cancer can irritate or damage airways, allowing bleeding. Chest infection, bronchitis, tuberculosis, blood-thinning medicines, a blood clot, and bleeding from the nose or mouth can have similar appearances. The source and amount matter, as do breathlessness, chest pain, fever, weight change, a persistent cough, and smoking or occupational exposure. A clinician may examine you and arrange imaging or other tests to identify where the bleeding comes from.

Contact a healthcare professional promptly, even if the blood is only streaking mucus or has stopped. Note its colour, approximate amount, how often it happened, whether it followed forceful coughing, and any medicines that affect clotting. Avoid smoking and strenuous activity until assessed. Do not stop a prescribed blood thinner unless a clinician tells you to. If possible, keep a photograph or sample to help describe the episode.

Call emergency services for heavy or ongoing bleeding, difficulty breathing, chest or upper-back pain, faintness, confusion, blue lips, or a very fast heartbeat. Emergency assessment is also needed if coughing up blood follows a recent operation, prolonged immobility, or a leg that is swollen and painful. Do not drive yourself if you feel weak or breathless.

Ask where the blood may be coming from, which tests are appropriate, whether your medicines affect bleeding, and what warning signs should send you to emergency care. Share smoking history, previous lung disease, recent infections, and any chest symptoms.