I am a 39 y.o non-smoking female. For the past ten days, after waking & showering, when clearing my throat & spitting into the sink there is a streak of bright red blood. Nothing after that. On occassion, when I blow my nose there is a tiny smidge of red blood - but I don't have a cold, so am rarely blowing my nose. I had a normal chest xray last week. My family doctor said it could be the dry winter air. I am not coughing and am not otherwise ill. How much, if any, further investigation of this "problem" would be warranted.