People can cough up blood due to various lung conditions. The blood may be bright red or pink and frothy. It also could be mixed with mucus. Coughing up blood from the lower respiratory tract also is known as hemoptysis (he-MOP-tih-sis).
Coughing up blood, even in small amounts, can be alarming. But producing sputum with a small amount of blood in it isn't uncommon, and it usually isn't serious. But if you're coughing up blood often or in large amounts, call 911 or seek emergency care.
Call your healthcare professional if you're coughing up blood. Your healthcare professional can determine whether the cause is minor or more serious. Call 911 or your local emergency number if you're coughing up a lot of blood or the bleeding won't stop.
Show References
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Original article: https://www.mayoclinic.org/symptoms/coughing-up-blood/basics/causes/sym-20050934