I've had the following checked: Complete blood workup (iron, thyroid, vitamins, etc), hormone panel (free testerone, FSH, etc) and have seen a derm, ob-gyn, and primary care physician. My hair has been falling out for 7 months, and I've had no major illness, stress, etc. Its getting pretty thin, and hasn't stopped falling out. It's got a lovely white bulb on the end, and its falling out all over my scalp. Noone seems to have an answer to what's going on!