Can a chest infection cause blood-streaked phlegm?

Yes, coughing and airway inflammation can cause streaks, but blood still needs assessment rather than assuming infection.

What tests might be needed?

Depending on risk and symptoms, tests can include a chest X-ray, blood tests, sputum testing or a CT scan.

Could the blood be from my nose?

Blood from a nosebleed can run down the throat. Tell the clinician whether you coughed, vomited or noticed nasal bleeding.

Coughing up blood: When to See a GP

What could coughing up blood mean?

Coughing up blood can appear as small streaks in phlegm from an infection or irritated airway, but it can also signal a blood clot, tuberculosis or cancer. Even a few spots or streaks should be assessed urgently. More than a few streaks, breathing difficulty, chest pain or a very fast heartbeat requires 999.

Who should skip this page?

Skip this page if you need a diagnosis, a prescription, or emergency care. It cannot replace a GP, pharmacist, NHS 111 or 999. If you are in immediate danger, call 999; for urgent advice that is not life-threatening, call 111 in England, Scotland or Wales, or use your GP out-of-hours service in Northern Ireland.

Possible causes

Common causes include a severe cough, bronchitis, pneumonia or bronchiectasis. More serious possibilities include a pulmonary embolism, tuberculosis or lung cancer.

What to tell the clinician

Describe the colour and amount, when it began, fever, chest pain, breathlessness, weight loss, leg swelling, recent travel, smoking and blood-thinning medicines.

Do not delay

The amount can change quickly, and symptoms alone cannot reliably identify the source. Arrange the recommended urgent assessment.

Common questions about coughing up blood

Can a chest infection cause blood-streaked phlegm?: Yes, coughing and airway inflammation can cause streaks, but blood still needs assessment rather than assuming infection.
What tests might be needed?: Depending on risk and symptoms, tests can include a chest X-ray, blood tests, sputum testing or a CT scan.
Could the blood be from my nose?: Blood from a nosebleed can run down the throat. Tell the clinician whether you coughed, vomited or noticed nasal bleeding.

Sources

NHS — Coughing up blood

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Coughing up blood