I just had to get a blood test for this, or had to convince my doctor to give me one. Not to sounds completely weird, but lately I have had bad Body odor under my arms and I was freaked out! I wouldn't even sweat, just smell,,, and I shower at least once or twice a day and pride myself on being a clean person... Also, my toenails have become very brittle... at a bbq at my brothers house, I was talking to his friends fiance who is a nurse, and she said these were symptoms of a thyroid disorder. I am waiting to hear back from my doctor...