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Hypothyroidism is a conditon in which the thyroid gland is underactive.
Normally, the tyroid is responsible for producing tyroxine which in turn is responsible for different metabolic events in the body. Typically, in hypothyroid patients, the thyroxine level is low and the so-called TSH is high. No, pregnanyc did NOT cause this. There are other causes, however. The most common cause in this country is Hashimoto's thyroiditis or an inflammation of the thyroid gland.