Basal Body Temperature and Thyroid Function 

Thyroid hormone is secreted from a gland in the area of the “Adam's apple” and helps regulate the entire body's activity level (metabolism). Low body temperatures can be a sign of decreased metabolism. This can be caused by thyroid imbalances as well as other hormonal and nutritional problems. Lab studies often miss thyroid problems that aren't immediately life-threatening. By checking your axillary temperature (under the arm) every morning you can see if your metabolism is running at its peak. 
Shake your mercury thermometer down in the evening within arm's reach of your bed. 
Upon awakening in the morning (before getting out of bed) place the thermometer under your armpit. Remain very still and read the temperature at 10 minutes. 
Record the temperature for 10 different days. 
At the completion of your 10-day cycle add all the temperatures and divide by 10. If your average temperature is below 97.5 degrees Fahrenheit it is probable that you will benefit from thyroid evaluation and treatment. This type of evaluation is best understood by doctors who specialize in functional, holistic, alternative or integrative medicine. More information on this concept is available at www.brodabarnes.org