I used to have this 2-4 days of sore throat (with mild fever and some maybe mild sputum coughing) at max 2-3 times a year and other than nothing else at all.

I used to have this 2-4 days of sore throat (with mild fever and some maybe mild sputum coughing) at max 2-3 times a year and other than nothing else at all. Since last one and a half years I have this daily thing - in the morning I wake up with slightly thick sputum accumulated in my throat (more if I was sleeping in AC or fan was too fast or it was colder that night) and then throughout the day there's always something that feels sticky around the throat. I never had this. Talked to 5-6 doctors. They did CT Scan of face (cross-section I guess), chest x rays and put a camera in my noses to look infection and they said there's none inside. So it's just allergy to pollution and pollens (or something else) that finally kicked in or something like that. I live in a polluted city which has a pollen problem since decades. Last summer I backpacked in Europe for two months. The symptoms were gone exactly for that period (showing a little in some colder parts of Eastern Europe when I was there). It's sad. They all basically say I have to live with it now. PS. They also found out that I have DNS (CT Scan and couldn't inset that camera thing in my left nose) and suggested either surgery or just keep taking saline nasal spray and they said it might not really help with my condition. I guess at some point something just changes.