I was recently treated for pneumonia with antibiotics, and during that time I had very bad coughs. Its been a couple weeks since the end of the antibiotics course and I'm feeling great again, no symptoms whatsoever. 6 days ago I tasted blood in my mouth, forced out some phlegm and it had some streaks of blood. Today, the same happened. The phlegm is usually white, but sometimes yellow. I do intense work-outs that cause my breathing rate to rise a lot, so maybe that ruptures blood vessels? What is causing this blood?
If you are getting blood in your phlegm you need to speak to a doctor about it very soon. It could be something serious.