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Hypothyroidism, the condition of the thyroid gland not making enough thyroid hormone, is a common hormonal disorder. Perhaps because hypothyroidism is common and its symptoms can be widespread and vague, misconceptions abound. Let’s cover the facts.

Symptoms of hypothyroidism can include fatigue, dry skin, weight gain and hair loss. These symptoms can occur for many other reasons, so fortunately a very simple blood test can tell us whether an underactive thyroid is the culprit.

If hypothyroidism is suspected, the best thing to test first is TSH, or thyroid stimulating hormone. TSH is made...