I don't know about directly associated with thyroid, but there IS a separate autoimmune cause of hearing loss that is possible (Rush Limbaugh had this, I believe)..Since people who have one autoimmune disease are at increased risk of developing another, I'd take any hearing loss seriously and get a workup.
Endocrine disorders such as diabetes and hypothyroidism can cause hearing loss. I searched 'hearing loss and hypothyroidism' and found that hearing loss is one of the symptoms of hypothyroidism and also found info that indicates about half the people with low thyroid function have hearing losses.
My own experience is that before I was diagnosed I couldn't clearly hear the words in a lot of songs because they just seemed to run together. Same thing a lot of times when I was on the phone - I just didn't seem to hear clearly. It's gotten better since I've been on Levoxyl.
Thank you all. I was beginning to think it was all in my head. I've been a little irritated with my family for not hearing me when I speak but they've all said that I'm not speaking loudly enough. Then I noticed I was having trouble hearing clearly. I'll mention this to my endo next week.