<Table> <Tr> <Th_colspan="2"> Hypothyroidism </Th> </Tr> <Tr> <Th> Synonyms </Th> <Td> Underactive thyroid, low thyroid, hypothyreosis </Td> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> Molecular structure of thyroxine, the deficiency of which causes the symptoms of hypothyroidism </Td> </Tr> <Tr> <Th> Pronunciation </Th> <Td> <Ul> <Li> / ˌhaɪpəˈθaɪərɔɪdɪzəm, - poʊ - / </Li> </Ul> </Td> </Tr> <Tr> <Th> Specialty </Th> <Td> Endocrinology </Td> </Tr> <Tr> <Th> Symptoms </Th> <Td> Poor ability to tolerate cold, feeling tired, constipation, depression, weight gain </Td> </Tr> <Tr> <Th> Complications </Th> <Td> During pregnancy can result in cretinism in the baby </Td> </Tr> <Tr> <Th> Usual onset </Th> <Td>> 60 years old </Td> </Tr> <Tr> <Th> Causes </Th> <Td> Iodine deficiency, Hashimoto's thyroiditis </Td> </Tr> <Tr> <Th> Diagnostic method </Th> <Td> Blood tests (thyroid - stimulating hormone, thyroxine) </Td> </Tr> <Tr> <Th> Similar conditions </Th> <Td> Depression, dementia, heart failure, chronic fatigue syndrome </Td> </Tr> <Tr> <Th> Prevention </Th> <Td> Salt iodization </Td> </Tr> <Tr> <Th> Treatment </Th> <Td> Levothyroxine </Td> </Tr> <Tr> <Th> Frequency </Th> <Td> 0.3--0.4% (USA) </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Hypothyroidism </Th> </Tr>

Which disorder is a common form of hypothyroidism