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Underactive thyroid

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Introduction
An underactive thyroid, also called hypothyroidism, means your thyroid gland does not produce enough chemicals called hormones.
Symptoms of underactive thyroid
Many symptoms of an underactive thyroid (hypothyroidism) are the same as those for other conditions, so they can easily be confused for something else.
Causes of underactive thyroid
An underactive thyroid (hypothyroidism) is when your thyroid gland doesn't produce enough of the hormone thyroxine, also called T4.
Diagnosing underactive thyroid
If you have symptoms of an underactive thyroid (hypothyroidism), see your GP and ask for a blood test.
Treating underactive thyroid
An underactive thyroid (hypothyroidism) is usually treated by taking hormone-replacement tablets called levothyroxine.
Complications of underactive thyroid
Several complications can occur if you have an underactive thyroid that is not treated.