just in case you need more convincing:
straight from one of the top docs at a local hospital:
"The thyroid gland influences many organs, tissues and cells in the body.
If the thyroid is not working properly, then a number of symptoms result,
including weight changes, mood swings and menstrual disturbances. If
left untreated, thyroid disease can cause elevated cholesterol levels, and
subsequent heart disease, infertility, muscle weakness or osteoporosis
and, in extreme cases, coma or death. "