I'm 5 weeks into NTM treatment with the "big 3" and everything was going well (body adjusting to the meds, increased energy, reduced cough, etc.) until yesterday - Friday - at 5 minutes after 5 pm. I felt a sudden need to cough and coughed up blood. I couldn't reach my doctors because it's the weekend and I knew I hadn't coughed up enough blood to warrant going to ER. The experience put me in a mild state of panic. I managed to calm myself down and the bleeding didn't continue but I want to understand it. Has anyone else coughed up blood while on the treatment? If so, what was the explanation?