When my thyroid is low, I tend to get urinary tract infections more often. I am also very sensitive to ibuprofen because it causes bladder irritation for me. Even when I drink lots of water.
I really would not say it is from the Armour. It could be that your immune system is low because of being SOOOOO hypo.
That is my 2cents on the subject!!!
I forgot to add that if you can tolerate eating yogurt, just one container a day will keep that yeast under control. I tried it and it worked, no kiddin.