Hypothyroidism occurs when the thyroid gland doesn't produce enough thyroid hormone. This slows metabolism and causes fatigue, weight gain, cold intolerance, constipation, and depression. Hashimoto's thyroiditis is the most common cause.
Levothyroxine is a thyroid hormone replacement used to treat hypothyroidism and provide the body with adequate levels of thyroid hormone.
Liothyronine is a thyroid hormone replacement used to treat hypothyroidism and provide the body with adequate levels of thyroid hormone.
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