Coughing Up Blood

When is Coughing up Blood an Emergency?

woman sick in bed
When is coughing up blood an emergency and what are the possible causes?.

Symptom of Coughing up Blood (Hemoptysis)

Coughing up blood, otherwise known as hemoptysis, can be very frightening. It can also be confusing at first. Is the blood truly coming from your lungs, or could it be from a nosebleed, your esophagus, or from your stomach?

This symptom may occur when there is bleeding in the throat, or in the large or small airways of the lungs. Many people describe their symptom as spitting up blood-streaked mucus.

Blood that is coughed up is often mixed with phlegm and can have a bubbly appearance.

If you cough up blood it doesn’t necessarily mean you have lung cancer. There are many conditions that can cause this symptom, and only one of these is lung cancer. But since the outlook for lung cancer is better the earlier it's diagnosed, it is important to consult your doctor as soon as possible.

It is important to make a distinction between coughing up blood (hemoptysis) and blood that is brought up through your mouth from other regions of your body. “Pseudohemoptysis” is a term that describes spitting up blood that doesn’t come from your lungs or bronchial tubes. "Hematemesis" is a term that refers to blood that comes from your esophagus and stomach (throwing up blood.)

Some Possible Causes

The most common causes of coughing up blood are irritation in the airways from coughing or an infection. That said, hemoptysis is the only symptom in 7 percent of people diagnosed with lung cancer. Some possible causes of blood streaked sputum include:

  • Inflammation and irritation in the airways from repeated coughing
  • Bronchitis
  • Bronchiectasis
  • Lung cancer
  • Pneumonia
  • Pulmonary edema
  • Blood clots in the lungs (pulmonary embolus)
  • Tuberculosis – Tuberculosis is the most common cause of coughing up blood worldwide, but less common in the United States
  • Inhalation of a foreign body
  • Bleeding disorders – Bleeding disorders can be inherited, or due to medications or supplements that increase the time it takes for your blood to clot

When is Coughing up Blood an Emergency?

As noted above, coughing up blood can quickly become an emergency. Coughing up more than one teaspoon of blood is considered a medical emergency. Coughing up 100 cc of blood - only 1/3 of a cup is called massive hemoptysis, and has a mortality (death) rate of 30 percent. Don't try to drive yourself or have someone else drive you -- call 911. You should also call 911 immediately if you experience chest pain, shortness of breath, or lightheadedness, even if you cough up just a trace of blood. The problem is that coughing up blood can quickly cause airway obstruction and aspiration of the blood into your lungs.  Don't wait.  Call 911.

When to See Your Doctor

If you cough up blood – even a very slight amount just once – it is important to make an appointment to see your physician.  As noted above, hemoptysis is the only symptom in 7 percent of people diagnosed with lung cancer, and you may not have any further symptoms until the cancer has spread.

If possible, bringing a sample to your doctor’s appointment can be helpful. Wrapping the sample in plastic wrap or wax paper can preserve the sample better than wrapping it in tissue.

Questions Your Doctor May Ask You

  • How long has this been happening?
  • When did it begin? Was it while you were eating?
  • How much blood did you cough up? Was it mixed with mucus?
  • What other symptoms have you been experiencing? For example, a persistent cough, allergy symptoms, shortness of breath, hoarseness, wheezing, unexplained weight loss, or fatigue.
  • Have you had any episodes of choking?
  • Do you, or have you ever, smoked?
  • What medications are you taking (including any herbal supplements)?
  • What other medical conditions do you have?
  • Has anyone in your family had bronchitis, bleeding disorders, lung problems, or lung cancer?


Depending upon the amount of blood you are coughing up, your doctor will first want to make sure your airway is okay to prevent aspiration (breathing in the contents that are present in your mouth) and control any active bleeding. He will then recommend tests to determine the cause. Possible tests may include:

  • Lab tests to check your blood counts and look for any reason for bleeding
  • A chest x-ray to look for infection of any evidence of a tumor
  • A CT scan of your chest
  •  Bronchoscopy – To check for foreign bodies or evaluate your airways for a tumor


Treatment will depend on the cause of your symptoms as well as the amount of blood you have been coughing up.  Remember that if you only cough up blood once, and even if it is a small amount, it is still extremely important to see your doctor as soon as possible.  

If you are actively bleeding, a CT scan is usually the imaging test of choice to evaluate bleeding. Most bleeding in the airways stems from the bronchial arteries, and bronchial artery embolization (essentially putting a clot in the artery) is often an effective treatment.

Learn about how lung cancer is diagnosed, what you may expect, and your possible risk factors for lung cancer (it goes far beyond smoking, and at least one in five women who develop lung cancer have not smoked a single cigarette).


Bidwell, J. and R. Pachner. Hemoptysis: diagnosis and management. American Family Physician. 2005. 72(7):1253-60.

National Institute of Health. Medline Plus. Coughing up blood. Updated 06/22/15.

Ramirez Meia, A., Mendez Montero, J., Vasquez-Caicedo, M. et al. Radiological Evaluation and Endovascular Treatment of Hemoptysis. Current Problems in Diagnostic Radiology. 2016. 45(3):215-24.

Yendamuri, S. Massive Airway Hemorrhage. Thoracic Surgery Clinics. 2015. 25(3):255-60.

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