T.C.
I have really bad allergies to just about any tree, grass, or weed pollen, and have always gotten a lot of sinus infections. It was better when I first moved to a different state, or treated my allergy symptoms before they snowballed into an infection. But after a few years of managing OK, I started getting more frequent sinus infections. Then tonsil infections. Then ear infections. Finally, I had my tonsils out and I have not gotten an ear infection since.
I don't know if it's just a coincidence, because I am also taking Zyrtec, Astelin spray, and allergy shots. Asthma inhaler and prednisone if things get really bad. And last month I had bronchitis and had to take 2 rounds of antibiotics to get over it.