Pulmonary Embolism Does NOT Usually Cause Hemoptysis
Based on the most recent and authoritative evidence, pulmonary embolism (answer a) is the correct answer—it does NOT usually cause hemoptysis. 1
Evidence-Based Reasoning
The 2020 ACR Appropriateness Criteria for Hemoptysis explicitly states that "Pulmonary embolus is an uncommon cause of hemoptysis, and there is only a single study that reports pulmonary embolus as one of the primary causes of hemoptysis" 1. This guideline represents the most authoritative and recent evidence on this topic.
Common Causes of Hemoptysis (What DOES Cause It)
According to the same guideline, the most common causes vary by setting but consistently include 1:
In primary care settings:
- Acute respiratory tract infections (pneumonia) ✓
- Chronic obstructive pulmonary disease
- Malignancy
- Bronchiectasis ✓
In tertiary referral centers (North America/Europe):
- Bronchiectasis ✓
- Respiratory infections (pneumonia) ✓
- Lung carcinomas (including bronchial adenomas) ✓
In developing countries:
- Tuberculosis and its sequelae ✓
Why the Other Options Are Wrong
- Tuberculosis (b): Explicitly listed as "the most prevalent cause of hemoptysis in developing countries" and remains a major cause globally 1
- Pneumonia (c): Listed as one of the most common causes in primary care settings under "acute respiratory tract infections" 1
- Bronchiectasis (d): Consistently identified as one of the top causes across all settings 1, 2
- Bronchial adenoma (e): Falls under lung malignancies/carcinomas, which are among the most common causes in tertiary centers 1
Clinical Pitfall to Avoid
While pulmonary embolism can occasionally present with hemoptysis (particularly in pulmonary infarction), it should not be high on your differential diagnosis for hemoptysis alone. If you're seeing hemoptysis in a patient, think infection, malignancy, or bronchiectasis first—not PE. The guideline emphasizes that PE causing hemoptysis is so uncommon that only a single study has reported it as a primary cause 1.