Every time I get a cold, which has been four times since late August, it morphs into this terrible, chesty congesty cough. I've been on antibiotics three times for bronchitis, but while it knocks out whatever infection I have at the time, the next cold I get knocks me right out of commission again. I manage my allergies with Nasacort, don't have asthma and don't smoke, so there doesn't seem to be any environmental cause. I'm really tired of this, and my doc doesn't know what's going on.
Yesterday, I did the terrifying thing and googled causes of repeated bronchitis, and a couple sites said that hypothyroidism could cause recurrent sinus infections and bronchitis. I couldn't find any peer-reviewed papers on the topic, though. For what it's worth, I have a few other symptoms that could point to hypothyroidism, but also could just be random (weight gain, depression, newly-acquired phobias, fatigue, weirdly-high cholesterol, dry skin, heavy periods and carpal tunnel syndrome). I had my thyroid tested a couple years ago, and it was on the low side of normal, but within the acceptable range.