what does the thyroid control
Thyroid hormones control metabolism, growth, body temperature, muscle strength, appetite, and the health of your heart, brain, kidneys, and reproductive system. Thyroid cells are the only cells in the body that absorb iodine.hen things go wrong. Thyroid disease occurs when your thyroid under-or over-produces the correct amount of thyroid hormone. It can cause elevated cholesterol levels, heart disease, infertility, muscle weakness, osteoporosis, coma, and even death. Thyroid disease can be hereditary.