Coughing up blood from the respiratory tract is called hemoptysis. The amount of blood produced can vary from a few streaks of blood mixed with normal sputum to large amounts of pure blood. Other symptoms, such as fever and difficulty breathing, may be present depending on the cause of hemoptysis.
Although hemoptysis can be frightening, most causes turn out not to be serious. Blood-streaked sputum is common in many minor respiratory illnesses, such as upper respiratory infections and viral bronchitis. Sometimes the cause is blood from the nose that has traveled down the throat and then is coughed up. Such blood is not considered hemoptysis.
Infection is the most common cause (see Table 2: Some Causes and Features of Hemoptysis). In adults, 70 to 90% of cases are caused by
In children, common causes are
Less common causes:
Lung cancer that starts in the lungs is an important cause in smokers over age 40. However, cancer that has spread to the lungs from elsewhere in the body rarely causes hemoptysis. Fungal infection with Aspergillus is increasingly recognized as a cause but is not as common as cancer. Tuberculosis is a possible cause.
Other causes include a blood clot in an artery in a lung (pulmonary embolism) and inflammation of blood vessels (vasculitis) in the lung, such as Goodpasture syndrome or granulomatosis with polyangiitis (Wegener granulomatosis).
Massive hemoptysis is the production of more than a pint (about 600 milliliters) of blood within 24 hours. The most common causes include the following:
Some conditions increase the risk that hemoptysis is caused by a serious disorder:
The following information can help people decide whether a doctor's evaluation is needed and help them know what to expect during the evaluation.
In people with hemoptysis, the following symptoms are of particular concern:
When to see a doctor:
People with warning signs should go the hospital immediately. People without warning signs who have risk factors for serious disorders and those with more than just blood-streaked sputum should see a doctor in a day or two.
If people have only blood-streaked sputum (which is usually caused by an upper respiratory infection), a doctor's evaluation is not as urgent. People can call a doctor, who can decide whether and how rapidly they need to be seen based on their symptoms, medical history, and other factors. Typically, a delay of a few days or so is not harmful.
What the doctor does:
Doctors first ask questions about the person's symptoms and medical history and then do a physical examination. What doctors find during the history and physical examination often suggests a cause and the tests that may need to be done (see Table 2: Some Causes and Features of Hemoptysis).
Doctors determine whether blood was actually coughed (and not vomited or dripped down the back of the throat from a nosebleed).
Doctors ask people about their medical history (if not already known) and their risk factors for causes. A history of frequent nosebleeds, easy bruising, or liver disease suggests a possible blood clotting disorder. Doctors review the drugs the person is taking to check for drugs that inhibit clotting (anticoagulants).
During the physical examination, doctors review vital signs to check for fever, rapid heart or breathing rate, and test for a low oxygen level in the blood. They do a full heart and lung examination, inspect the neck veins for signs of fullness such as bulging, and check the legs for puffiness. Puffiness in one leg may indicate deep vein thrombosis. Puffiness in both legs may indicate heart failure. Doctors also examine the abdomen, skin, and mucous membranes. The person is asked to cough during the examination. If any blood is coughed up, the doctor notes its color and the amount of blood. Doctors also check the nose and mouth for bleeding sites.
Clues from the history and examination help doctors determine the cause. A sensation of postnasal drip or any bleeding from the nose, particularly without coughing, may mean that the blood being coughed up has dripped down the back of the throat from the nose. Nausea and vomiting of black, brown, or coffee-ground–colored material usually means that the blood is from the stomach or intestine and is being vomited and not coughed. Frothy sputum, bright red blood, and, if the amount is massive, a sensation of choking usually mean that the blood is from the trachea or lungs (called true hemoptysis).
If cough has just begun and if the person is otherwise in good health and has no risk factors for tuberculosis, fungal infection, or pulmonary embolism, the cause is usually an acute respiratory infection, such as bronchitis. If coughing up blood is caused by a heart or lung disorder, the person has almost always already been diagnosed with that heart or lung disorder. That is, coughing up blood is usually not the first symptom of a heart or lung disorder.
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If hemoptysis is severe, persistent, or unexplained, testing is needed. If people have coughed up massive amounts of blood, they are treated and their condition is stabilized before testing is done.
A chest x-ray is taken routinely. If the chest x-ray is abnormal or if the person has symptoms of or risk factors for a particular disorder, computed tomography (CT) and bronchoscopy are done. In bronchoscopy, a flexible viewing tube is inserted into the windpipe and bronchi to identify the bleeding site. Occasionally, bronchoscopy is necessary to confirm that blood is being coughed up from the lower airways and not from the nose, stomach, or intestine.
If pulmonary embolism seems possible, doctors do CT using a radiopaque dye to show blood vessels (called CT angiography) or a scan using a radioactive marker (called a lung perfusion scan—see Diagnosis). Depending on the results of that scan, pulmonary arteriography may be done.
Doctors often check for lung cancer, especially in smokers over age 40 (and even in younger smokers if they started smoking during adolescence), even if the sputum is only blood-streaked.
In most people, a complete blood count and blood tests that assess the blood's ability to clot are done to detect blood clotting problems.
Despite testing, the cause of hemoptysis is not identified in 30 to 40% of people. However, when hemoptysis is severe, the cause is usually identified.
Bleeding may produce clots that block the airways and lead to further breathing problems. Therefore, coughing is important to keep the airways clear and should not be suppressed with cough suppressants (antitussive drugs).
Hemoptysis may be mild and may stop by itself or when the disorder causing the bleeding (such as heart failure or infection) is successfully treated.
If a large clot blocks a major airway, doctors may have to remove the clot using bronchoscopy.
Rarely, hemoptysis is severe or does not stop by itself. If so, a tube may need to be inserted through the mouth or nose into the windpipe or lower into the airways to help keep the airways open.
If the source of bleeding is a major blood vessel, a doctor may try to close off the bleeding vessel using a procedure called bronchial artery angiography and embolization. Using x-rays for guidance, the doctor passes a catheter into the vessel and then injects a chemical, fragments of a gelatin sponge, or a wire coil to block the blood vessel and thereby stop the bleeding. Sometimes bronchoscopy or surgery may be needed to stop severe or continuing bleeding, or surgery may be needed to remove a diseased or cancerous portion of the lung. These high-risk procedures are used only as last resorts.
If clotting abnormalities are contributing to the bleeding, a person may need a transfusion of plasma, clotting factors, or platelets.
Last full review/revision October 2014 by Noah Lechtzin, MD, MHS