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

See a doctor immediately if you cough up blood or blood-streaked phlegm. This symptom (hemoptysis) can signal serious underlying conditions that require prompt diagnosis and treatment.

Common Causes

• Infections: Tuberculosis, pneumonia, bronchitis, bronchiectasis
• Lung Cancer: A leading cause, especially in smokers
• Vascular Issues: Pulmonary embolism, aortic aneurysm
• Heart Failure: Can cause fluid buildup and bleeding in the lungs
• Other: Trauma, autoimmune diseases, blood clotting disorders

What to Expect

Your doctor will likely order a chest X-ray, sputum culture, blood tests, and possibly a CT scan or bronchoscopy to identify the source. Treatment depends entirely on the underlying cause.

Do not ignore this symptom—early evaluation saves lives.