Coughing Up Blood (Hemoptysis): Causes Beyond Pulmonary Embolism

Coughing up blood (hemoptysis) is alarming but not always due to blood clots (pulmonary embolism). Many respiratory and systemic conditions can cause it. Any hemoptysis requires medical evaluation.

Common Non-Embolic Causes

1. Respiratory infections: Bronchitis, pneumonia, tuberculosis – inflammation damages airway vessels.
2. Chronic bronchitis/COPD: Long-term irritation fragilizes bronchial vessels, especially in smokers.
3. Bronchiectasis: Permanently dilated, inflamed airways prone to bleeding.
4. Lung cancer: Tumors erode blood vessels; risk increases with age and smoking history.
5. Pulmonary fibrosis: Scarring distorts vascular architecture.
6. Cardiovascular causes: Mitral stenosis, pulmonary hypertension, left heart failure (pulmonary edema) – can cause pink, frothy sputum.
7. Trauma: Chest injury, foreign body, or post-procedure (bronchoscopy, biopsy).
8. Medications: Anticoagulants, antiplatelets, thrombolytics increase bleeding risk.
9. Autoimmune/vasculitic conditions: Granulomatosis with polyangiitis, Goodpasture syndrome.

Evaluation Approach

Doctors assess volume (streaks vs. massive), duration, associated symptoms, and risk factors. Tests may include chest X-ray, CT angiography, bronchoscopy, sputum culture, and coagulation studies.

When to Seek Emergency Care

• Massive hemoptysis (>100-200 mL in 24 hours)
• Shortness of breath, dizziness, chest pain
• Known lung cancer or high-risk profile

Even small amounts warrant a doctor's visit to determine the cause and initiate appropriate treatment.