Curious to know how many who share this constant phlegm issue have a history of severe food allergies or childhood or adult asthma. Some studies suggest we are more at risk for chronic inflammation post covid. For many of us, mucus production is worse after eating. Discussions on this thread of LPR being the potential cause but no one is certain.

I have history of anaphlaxis to peanuts and childhood asthma. Since getting COVID 3 years ago, I've been battling mucus that come from sinus' and back of throat and lungs, clear white and occasionally yellow. I will often notice increase mucus and slight expiratory wheeze after eating. I think it's related to common food allergy type foods.

I have tried to go gluten free (not perfect) and I seem to have less of a reaction. Some studies suggest that Covid can create new food sensitivities and gluten is a big one. I would cut out gluten, consider cutting out eggs as well, and see what happens. Ideally do a food elimination diet (chicken and rice) and then gradually add things back in based on symptoms.

I also take a Claritin, Omega 3, NAC, and mucinex to cover my bases each morning.

I'm not cured but I think it may be more manageable. Be interested to hear what other people experience and it going gluten free helps.

Good luck and I hope we can find an answer to this challenge,
Peter