Cough
Coughing Up Blood: 8 Causes, Treatment & When to See a Doctor
Coughing up blood is not always a serious symptom, and can occur with mild conditions like a scratch in the nose or throat. Coughing up large amounts of bright red blood, however, can be a sign of a more serious illness, like pneumonia, tuberculosis, or lung cancer. Learn more about what causes blood when coughing.