Bloody sputum — medically called hemoptysis — means blood mixed with mucus from the airways. Causes range from minor airway irritation to serious lung conditions. This page explains what bloody sputum can indicate, common causes, warning signs that need urgent care, and what details help clinicians investigate the problem.
Blood in sputum most often originates from the lungs or large airways (bronchi). Sometimes blood is from the nose or mouth and has been swallowed then coughed up, or it may come from the upper digestive tract. Identifying the true source helps guide tests and treatment.
Causes include respiratory infections (acute bronchitis, pneumonia), chronic airway diseases such as bronchiectasis, tuberculosis, pulmonary embolism, trauma, and lung tumors. Nosebleeds and blood swallowed from the mouth can mimic hemoptysis. Factors that increase bleeding risk include anticoagulant use and bleeding disorders, as well as smoking and chronic lung disease.
Seek urgent evaluation if bleeding continues or increases, if you develop worsening breathlessness, chest pain, fainting or confusion, low blood pressure, or a very fast pulse. These signs can indicate a serious problem — contact emergency services or go to the nearest emergency department.
Assessment starts with a focused history (amount and timing of bleeding, smoking, medication and travel history) and physical exam. Tests may include chest X‑ray or CT scan, sputum tests, blood work and, when needed, bronchoscopy. Pulmonology, Thoracic Surgery, Infectious Diseases and Clinical Microbiology, and Primary Care frequently coordinate care and referrals.
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