Coughing Up Blood (Hemoptysis): Causes & When to See a Doctor

What exactly is hemoptysis?

Hemoptysis means coughing up blood that comes from the respiratory tract — the lungs, bronchi, or trachea. It can look like:

• Bright red blood, sometimes frothy
• Pink-tinged or rust-colored mucus (blood mixed with sputum)
• Small streaks of blood in otherwise clear or white phlegm

It is different from blood that comes from the mouth, gums, nose, or stomach (which drips back and is coughed up rather than originating in the lungs). More than 90% of cases are mild or self-limiting, but because serious causes exist, clinician evaluation is always appropriate 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis.

What are the most common causes?

More common, often less serious causes [2]: - Acute bronchitis — Airway inflammation from a respiratory infection can cause small amounts of blood-streaked mucus. - Pneumonia — Infection in the lung can produce rust-colored or blood-streaked sputum. - Tuberculosis (TB) — An important consideration, especially in people who have lived in or traveled to areas with higher TB rates. - Bronchiectasis — Damaged, widened airways (often from past infections) can bleed periodically. - Severe prolonged coughing — Can irritate and rupture tiny blood vessels in the airway lining.

Less common, more serious causes: - Lung cancer — A persistent cough with blood, especially in a current or former smoker, requires evaluation for malignancy 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis. - Pulmonary embolism (PE) — A blood clot in the lungs can cause sudden cough with blood, often alongside shortness of breath and chest pain. - Pulmonary hypertension or heart failure — Can produce blood-tinged sputum (frothy pink mucus). - Vascular abnormalities — Arteriovenous malformations or abnormal blood vessels in the lung.

Which specialist should I see?

Because the causes of hemoptysis span several organ systems, the right specialist depends on what the initial evaluation suggests 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis:

• Pulmonologist (lung specialist): The most common first referral for hemoptysis of unclear origin. They can perform bronchoscopy — a camera examination of the airways — to identify the source of bleeding.
• Infectious disease specialist: If TB or a fungal lung infection is suspected.
• Oncologist: If lung cancer is suspected after imaging.
• Interventional radiologist or cardiothoracic surgeon: For cases where a bleeding vessel needs to be blocked or surgically addressed 3Ref 3Society of Chest Imaging and Interventions (2023).Consensus Guidelines for the Interventional Radiology Management of Hemoptysis.CT with IV contrast recommended after first episode of hemoptysis of any severity; bronchial artery embolization as primary intervention for massive or recurrent hemoptysis.

Your primary care clinician will typically order a chest X-ray and sometimes a CT scan first, then direct your referral based on the findings. Gale can help you understand your results and navigate next steps.

What will the evaluation involve?

A clinician evaluating hemoptysis will usually begin with 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis:

1. History: How much blood, how often, for how long; smoking history; recent respiratory illnesses; travel history; medications (blood thinners can worsen any bleeding). 2. Chest X-ray — First-line imaging to look for masses, infiltrates, or structural abnormalities. 3. CT scan of the chest — More sensitive than X-ray; often the key diagnostic step. Current guidelines recommend CT with IV contrast after a first episode of hemoptysis of any severity 3Ref 3Society of Chest Imaging and Interventions (2023).Consensus Guidelines for the Interventional Radiology Management of Hemoptysis.CT with IV contrast recommended after first episode of hemoptysis of any severity; bronchial artery embolization as primary intervention for massive or recurrent hemoptysis. 4. Sputum tests — To look for infection, including TB. 5. Bronchoscopy — A flexible camera threaded into the airways; allows direct visualization and, in some cases, treatment of the bleeding source 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis.

Is a small amount of blood serious?

Even a small amount of blood in sputum should not be dismissed, but it does not necessarily mean something life-threatening 1Ref 1MedlinePlus (U.S. National Library of Medicine) (2023).Coughing up blood.Clinical definition of hemoptysis, common causes, when to seek medical help (any amount of coughed-up blood warrants clinician contact), and distinguishing hemoptysis from pseudohemoptysis. Streaks of blood during a bout of bronchitis are common. However, because serious causes — including lung cancer — can begin with small amounts of blood and a doctor cannot distinguish the cause without examination, any hemoptysis warrants a clinician visit rather than watchful waiting at home.

Massive hemoptysis — typically defined as more than 100–200 mL in 24 hours — carries a high mortality rate and is a medical emergency requiring immediate care 2Ref 2O'Gurek D, Choi HYJ (2022).Hemoptysis: Evaluation and Management.Most common causes of hemoptysis (respiratory infections, bronchiectasis, malignancy, COPD), evaluation approach (history, X-ray, CT, sputum, bronchoscopy), specialist referral guidance, and mortality rates with massive hemoptysis.