What does it mean when you are coughing blood?

Hemoptysis: Technical term is called hemoptysis. It suggest bleeding anyway from the nasopharynx/throat area to the bottom of the lungs.

Many possible causes: Per Mayo Clinic, possible reasons for coughing blood include: chronic bronchitis, bronchiectasis, Pulmonary Tuberculosis, Chronic obstructive pulmonary disease, lung cancer, cystic Fibrosis, pneumonia, abscess of lung, emphysema,pulmonary embolism, chest trauma, parasitic infections. See: http://www.mayoclinic.org/symptoms/coughing-up-blood/basics/causes/sym-20050934

If you are: coughing up blood you need to see a doctor asap. there are many causes including tumors so get medical attention asap.

Means it is serious!: Coughing blood means you need to go see a doctor to find out the cause. It can be caused by a problem in the lungs. This can also be caused by a problem in the nose or throat. So you need toi be examined by a dcotor right away.