I coughed up blood in my phlegm about half a tsp. it was red regular color , not dark or anything. Maybe just one part that might have been dark red. I woke up from a nap and I had phlegm in my throat. I usually never have. I do not have a cold or anything, no cough at all. I only have a muscle strain in my stomach throat hurts when I move. (Abdominal tear). I went to the doctor they checked and said it was nothing didn't feel anything. So there was no need for sonogram . The pain starte in January lasted for about 2 months. IT went away for three months then came back now. I also had upper mid back pain for about three weeks when I would stand or walk longer than 2 minties. This was in May 2014 and it went away now. Why did I all of a sudden cough up blood? Is this an emergency?