I have a mild headache, runny nose and a cough. When I cough sometimes mucus mixed with blood comes up, and everytime I blow my nose blood comes out.

Coughing blood bad. Nose bleeds can not only drip out the front, but can also drip down the back and when that mucus is brought up it has bloody streaks. However, if the blood is truly being coughed from the lungs, it is very important to see a physician immediately for evaluation.