What are common symptoms of underactive thyroid?

Hypothyroid symptoms: There are several places in the cascade of hormone production, which when disrupted, cause the thyroid hormones to be low. Fatigue, increased sensitivity to cold, constipation, dry skin, unexplained weight gain, puffy face, impaired , muscle weakness, high cholesterol, hair loss, hoarseness, arthritis, low heart rate, depression, dry skin, abnormal menses are a few symptoms.

Underactive thyroid: Weight gain (usually no more than 10 to 15 pounds) and difficulty losing weight; cold intolerance; dry hair and skin; decreased sex drive; fatigue; weakness; muscle cramps; depression. Patients with mild hypothyroidism may not have any symptoms.