Everything feels okay then I would suddenly cough (just once) with white/yellowish phlegm. This happens maybe 5 to 10 times throughout the day.
It usually happens like this: I'm not doing anything then boom I suddenly cough just one time with no feeling of about to cough. The thing is, it's mostly single cough (multiple coughs sometimes).
It's been happening for about a month now. Any ideas what could this be?