The most common reason for coughing up blood is acute bronchitis, which typically gets better on its own without treatment. People with bronchitis with small amounts of blood in the mucus for less than a week can watch carefully and wait for their condition to improve.
Coughing up blood can also be a sign of a serious medical condition. Call your doctor if you have any of these symptoms:
Blood in mucus that lasts longer than a week, is severe or getting worse, or comes and goes over time
Soaking sweats at night
Fever higher than 101 degrees
Shortness of breath with your usual activity level
People requiring treatment for coughing blood are nearly always treated in a hospital, until the cause is identified, and the threat of serious bleeding passes.
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