My personal experience with low thyroid 3. February 2009 William Davis (31) Something happened to me around October-November of last year.I usually feel great. Ordinarily, my struggles are sleeping and relaxing. As with most people, I have too many projects on my schedule, though I find my activities stimulating and fascinating.I blasted through a very demanding November, trying to meet the needs of a book publisher. This involved sleeping only a few hours a night for several days on end, all after a full day of office practice and hospital duties.But it was getting tougher. My concentration was becoming more fragmented. Getting things done was proving an elusive goal. Exercise became a real chore.Although I usually force myself to go to sleep, I was starting to fall asleep before my usual bedtime, and I was sleeping longer than usual.It's been a tough winter in Wisconsin. Let's face it: It's Wisconsin. But it's been tough even for this region, with weeks of temperatures consistently below 10 degrees. Even so, I was having a heck of a time keeping warm. Extra shirts, socks, soaking my hands in hot water--none of it worked and I was freezing.So I had my thyroid values checked:Free T3: 2.6 pg/ml (Ref 2.3-4.2)Free T4: 1.20 ng/dl (Ref 0.89-1.76)TSH: 1.528 uUI/ml (Ref 0.350-5.500)Normal by virtually all standards. I measured my first morning oral temperature: 96.1, 96.3, 95.9. Hmmmm.My experience coincided with the Track Your Plaque and Heart Scan Blog conversations about low thyroid being enormously underappreciated, with the newest data on thyroid disease suggesting that a TSH for ideal health is probably 1.5 mIU or less. (More about that: Is normal TSH too high? and Thyroid perspective update .Could this simply be a case of medical student-oma in which every beginning medical student believes he has every disease he learns about?Despite the apparently "normal" thyroid blood tests, I took the leap and started taking Armour thyroid, beginning at 1/2 grain (30 mg), increasing to 1 grain (60 mg) after the first week.Within 10 days, I experienced:--Dramatic restoration of the ability to concentrate--A boost in mood. (In fact, the last few blog posts before I replaced thyroid reflect my deepening crabbiness.)--Large increase in energy, now restored to old levels--Need for less sleep--I'm warm again! (It's still <20 degrees, but I get easily stay warm while indoors.)I am absolutely, positively convinced of the power of thyroid. I am further convinced from the clinical data, patient experiences, and now my own personal experience, that low levels of hypothyroidism are being dramatically underappreciated and underdiagnosed.I shudder to think of what my life would have been like 6 months or a year from now without correction of thyroid hormone.Now, the tough question: Why the heck is this happening to so many people?