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How To Tell If You Have a Tired Thyroid

  • Your basal body temperature is the most sensitive functional test of thyroid function. Body temperature reflects metabolic rate, which is largely determined by hormones secreted by the thyroid gland. All you need is a thermometer. Although men and postmenopausal women can perform the test at any time, menstruating women should perform the test, on second, third, and fourth days of menstruation.
  • At night, before retiring, shake the thermometer until it registers below 95 degrees Fahrenheit and place it by your bed.
  • When you awake, place the thermometer in your armpit for a full 10 minutes. Lie as still as possible. (Lying down with your eyes closed is best.)
  • After 10 minutes, read and record the temperature and date.

  • Record the temperature for at least five mornings, perferably at the same time each day.
  • Give the results to your healthcare practitioner to interpret. Eliminate the highest and lowest value and average the other three. Your basal body temperature should be between 97.6 and 98.2 degrees Fahrenheit. Low basal body temperatures are very common and could reflect hypothyroidism. Less common is a high basal body temperature, which may be evidence of hyperthyroidism (with signs and symptoms such as bulging eyeballs, fast pulse, hyperactivity, inability to gain weight, insomnia, irritability, menstrual problems, and nervousness).

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