Later, you may develop signs and symptoms of underactive thyroid (hypothyroidism), which may include unexplained
weight gain, hoarse voice, constipation, puffy face, fatigue and increased sensitivity to cold. A diagnosis of hypothyroidism can be confirmed with blood tests. Treatment may include thyroid replacement hormone.
In many cases, thyroid function returns to normal, which may occur in as little as a month or take up to several years.