What should you know about lung cancer, coughing up blood and life expectancy?

Blood can come from irritated airways after forceful coughing, an infection such as pneumonia or tuberculosis, bronchiectasis, or a blood clot in the lung. It can also arise from the nose, mouth or throat and be mistaken for blood from the lungs. Lung cancer is one possible cause, but coughing up blood does not establish that diagnosis.

If cancer is confirmed, outlook depends on details such as the cancer type, its extent, cell features, overall health and response to treatment. Clinicians use examination, scans and laboratory or tissue tests to discuss an individual outlook. General figures found online may not match one person and should not replace a personalised conversation.

Contact a clinician promptly even if the blood is only streaking mucus. Note the amount and colour, how often it occurs, whether it follows coughing, and whether you have fever, chest pain, breathlessness, night sweats or weight loss. Bring a list of medicines, particularly blood thinners. Do not wait for a routine review if the symptom is recurring or increasing.

Call emergency services for heavy or ongoing bleeding, difficulty breathing, faintness, confusion, a rapid heartbeat, or sudden chest pain. These features can signal a serious airway or circulation problem and need immediate assessment.

Ask where the blood may be coming from, which tests are needed, whether a medicine contributes, and which confirmed findings would shape a discussion about your outlook and treatment choices.