If you are wondering why you are tired all the time you can do a temperature test to see if it may be due to an underactive thyroid (hypothyroidism). This test is an easy way to determine thyroid function using basal body temperature (the body’s temperature at rest). If the thyroid is running low, the body’s temperature will drop below normal while the body is at rest or asleep. This test is done by measuring the underarm or oral temperature upon waking after a night’s sleep. For accuracy, the test is performed five mornings in a row and then the average is calculated.

The instructions for performing the test are as follows:
1. The night before each morning temperature test, shake down the thermometer to below 97 degrees (use an oral glass thermometer only), and set it on the night stand next to the bed, on the side that you sleep.
2. Immediately upon waking, without raising your head from the pillow, place the thermometer under your armpit, or under your tongue. (If taking it orally, keep mouth closed why taking temperature.)
3. Leave thermometer in place for 10 full minutes.
4. Move as little as possible in this process; you must remain flat on your back during this entire time, otherwise the thyroid gland will be activated and a false reading will be taken.
5. After ten minutes, remove the thermometer and record temperature without expending any energy just before recording the temperature, i.e. getting up for any reason, shaking down the thermometer.

The normal range for basal body temperature is 97.8 – 98.2.

At the end of the 5 days, if your average temperature is below the 97.8 then please schedule an appointment with me to do any additional testing and help support your thyroid.

Other possible symptoms of underactive thyroid:

  • Menstrual bleeding changes
  • Hot flashes and night sweats
  • Infertility
  • Hair loss
  • Depression
  • Cold hands & feet
  • Elevated cholesterol
  • Irritability
  • Weight gain




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