 Well, the thyroid has a lot of functions. One of the common things that people have, you know, that women complain of when they have thyroid problems is, I'm losing hair. Oh. So hair loss is one of the common things that occur, and that's one of the things that people come in with problems. Nails also are affected by that. Putting on weight, it controls your metabolism, either being too heavy or too skinny. Mm-hmm.