I’m sorry you’re feeling bad. I’ve had yellow mucus for a long time and recently they decided it’s from chronic sinus inflammation. Both the local and Mayo radiologists and pulmonologists thought I had MAC, but it didn’t grow on bronch cultures. I have developed bronchiectasis.

Is it primarily in the mornings? Mucus that has been sitting around all night can become yellow and that isn’t considered significant if it clears during day.

Are you febrile? Eating and drinking ok? Try to eat and drink something and see if that helps.