I had cold and cough since last two weeks..no fever and other symptoms.. Initially cough was dry then since week it was wet cough. First took Azithromycin 500 one a day for 5 days, now cefixime 200 twice day and it's currently on 3rd day and currently taking Rexcof DX cough syrup 3 times day. Cough seems to be going away as compared to before but since past two days blood is coming in my sputum only in morning.. when I wake up,  i feel like coughing and sticky mucus comes with red colour then whole days nothing...wet cough is still there but much less than before. What could be bloody sputum reason please?