Hi, I can taste blood when I cough, but there is no visible blood. I do not actually have a persistent cough, but I am coughing just a bit more than usual. I also have a dull ache in my upper back and an itch that feels like it is under the skin on my upper back, but those symptoms only appear when I cough. I am generally in very good health, and do not have any other symptoms like fatigue or high temp or anything. Is it worth bothering my doctor?