The thyroid gland secretes hormones that control your metabolism, the rate at which your body burns energy. When the thyroid doesn't function properly, it can make your metabolism run too quickly or too slowly. Either problem can interfere with learning and memory. Research with animals demonstrates that changes in levels of thyroid hormones cause physiological changes in the hippocampus.
An overactive thyroid (hyperthyroidism) can impair your memory and your ability to sustain attention. Hyperthyroidism is also associated with anxiety, insomnia, and tremor. An underactive thyroid (hypothyroidism) can cause generalized cognitive slowing, sluggishness, and psychiatric symptoms. If you suffer from thyroid problems, getting the proper medical treatment should help prevent or diminish memory difficulties.
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