I've just been diagnosed with hypothyroidism and put on levothyroxine (0.075 mg/day), but I originally went to the doctor because I was having fainting spells. Are the two related, or could there be some other underlying cause for each? My blood work showed a higher than normal TSH, and I do have a lot of the other symptoms of hypothyroidism, but I can't find any information on a possible link to the fainting. My doctor also did a Holter recording, which came up normal. I even had a fainting episode while on the holter recorder, so it definitely doesn't seem heart-related. Any suggestions?