Hypothyroidism, often known as "underactive thyroid," occurs when the thyroid gland fails to generate enough of some necessary hormones. In its early stages, hypothyroidism may not present any apparent symptoms. Women in their middle to late years are disproportionately affected by hypothyroidism. Still, the disorder can strike anybody at any age, including babies. Newborns with dysfunctional or no thyroid gland may exhibit minimal symptoms at first. If your doctor believes you suffer from an autoimmune thyroid problem, they would likely suggest you have a thyroid antibody test.