@laurademaine Hi Laura, my history is very similar to that of @alleycatkate. What eventually led to the diagnosis of bronchiectasis and MAC (after about a year) was that I coughed up about 2-3 TBS blood while lap swimming in 2017. The blood scared me, so I went to the ER, and they did a CT scan. My only other symptom is that I cough up minor mucus/sputum in the mornings. I walk 2-2.5 miles/day, do other daily exercises, and have never taken the Big 3. I do nebulize 7% saline once daily and take one 600-mg capsule of NAC each day.