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I would go to a doctor and get it checked out. Coughing up blood is usually a serious issue. The most common reason, though, is simply trauma to the airway from severe coughing or illness. If it were your sinuses, you might be spitting up blood, but not coughing it up per se.
The more worrisome things it could be would be pulmonary embolism, pneumonia or cancer. Unlikely, but possible.
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Rick
1984 911 coupe
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