Coughing Up Blood After Bronchitis: When to Worry

Hemoptysis (coughing blood) after acute bronchitis is common and usually benign—caused by airway inflammation rupturing superficial capillaries.

Typical Benign Presentation

• Small amounts: streaks, tinged sputum, <5–10 mL/day
• Resolves within 3–7 days as inflammation subsides
• No systemic symptoms (fever, weight loss, night sweats)

Red Flags Requiring Immediate Evaluation

• >30–50 mL in 24 hrs (massive hemoptysis — airway compromise risk)
• Persistent >1 week
• Recurrent episodes
• Associated: chest pain, dyspnea, fever >101°F, weight loss, night sweats
• Risk factors: smoking, age >40, COPD, cancer history, anticoagulation, immunosuppression

Differential for Concerning Hemoptysis

• Pneumonia (especially gram-negative, TB, fungal)
• Lung cancer (bronchogenic carcinoma)
• Pulmonary embolism (pleuritic pain, dyspnea, tachycardia)
• Bronchiectasis (chronic, copious purulent sputum)
• TB (subacute, night sweats, weight loss)
• Vasculitis (GPA, Goodpasture's)
• Mitral stenosis

Workup

• CXR (first-line)
• CT chest (if CXR negative/equivocal)
• Sputum: culture, AFB, cytology
• CBC, coag, renal, BNP
• Bronchoscopy (localize, biopsy) if mass/hemoptysis persists

When in doubt, get evaluated. Most post-bronchitis hemoptysis is self-limited, but missing cancer or PE is catastrophic.