There is no known way to prevent autoimmune disorders that cause hypothyroidism, such as Hashimoto's thyroiditis. Careful monitoring of medications used to treat an overactive thyroid can help prevent hypothyroidism caused by destruction of too much of the gland tissue.
The long-term effects of untreated hypothyroidism can be profound. Severe, prolonged hypothyroidism can lead to multiple abnormalities within any system of the body including heart, brain, and skin. Untreated hypothyroidism can cause heart disease, osteoporosis or thinning of the bones, and infertility in women. If left untreated for many years, severe hypothyroidism can eventually lead to death.
The findings of a recent study have shown that pregnant women with hypothyroidism have 4 times the risk of miscarriage in the second trimester than other women. If the hypothyroidism is not treated appropriately, it can lead to communication\ \
Hypothyroidism is not contagious and poses no risk to others.