People with an underactive thyroid have an increased risk of developing dementia. This conclusion was made by scientists from Brown University in the United States.
Disorders of the thyroid gland in the elderly are associated with an increased risk of senile dementia. Older people with hypothyroidism, or an underactive thyroid, may have a higher risk of developing various forms of dementia, the researchers found. Hypothyroidism develops when the thyroid gland does not produce adequate amounts of hormones.
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While more research is needed to confirm these findings, people should be aware that thyroid disorders can increase the risk of dementia. The characteristic symptoms of hypothyroidism include a slow metabolism, constant fatigue, weight gain, and increased sensitivity to cold weather.
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Sometimes thyroid disorders associated with a risk of dementia are treatable. The authors of the study analyzed the medical records of 7,843 people with newly diagnosed dementia living in Taiwan. These data were compared with records for a similar number of people who did not have senile dementia. Scientists were particularly interested in the presence of hypothyroidism or hyperthyroidism, that is, an overactive thyroid gland that produces significantly higher levels of hormones. And this leads to sudden and unplanned weight loss and heart palpitations. (READ MORE) 
Brown University
Medicine
one of the most prestigious a private US university located in Providence, Rhode Island. 7th of the oldest national universities and 1 of 9 colonial colleges