Many people who find themselves coughing up blood are particularly worried if they have cancer, which they must be. Because the cause of this phenomenon is either the nasopharynx, lungs or bronchi, and many diseases of these organs can appear this phenomenon, there is no 100% cancer. 1.Nasopharynx. It is connected to the trachea, and if there is some disease here and there is bleeding, the blood will flow backwards like the trachea, thus the phenomenon of coughing with bleeding, but it is not necessarily nasopharyngeal cancer. For the sake of insurance, we still remind you to seek medical attention immediately for a comprehensive examination. 2. Lungs. If a person coughs or not, it often reflects the health of one’s lungs. If there is blood when coughing, it is most likely that your lungs have problems and may be bleeding from the lungs, which is a more serious situation and needs to be checked in a regular hospital. 3. Bronchial tubes. Although coughing and bleeding does not mean that you have cancer, but because it is related to our body’s important organs, so when this phenomenon occurs, we must seek medical examination and treatment at the first time.