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Hypothyroidism is a condition in which the thyroid gland does not make enough thyroid hormone. This condition is often called underactive thyroid. The most common cause of hypothyroidism is thyroiditis. It’s swelling and inflammation damage to the thyroid gland's cells. It’s caused by the immune system attacking the thyroid gland, viral infections or other respiratory infections. Other causes of hypothyroidism include c ertain medicines, such as lithium and amiodarone, congenital defects, radiation treatments to the neck or brain to treat different cancers, radioactive iodine used to treat an overactive thyroid gland, and surgical removal of part or all the thyroid gland.
Some early symptoms to look out for are constipation, increased sensitivity to cold temperature, fatigue , heavier and irregular menstrual periods, joint or muscle pain , paleness or dry skin, depression, thin, brittle hair or fingernails , weakness , and weight gain. If hypothyroidism goes untreated some long-term symptoms include decreased taste and smell, hoarseness, puffy face, hands and feet, slow speech, thickening of the skin, thinning eyebrows, low body temperature, and slow heart rate.