If you suspect your thyroid gland is sluggish, here is a handy way to find out.
More than 50 years ago, a doctor named Broda Barnes found that the basal (resting) body temperature is a good indicator of thyroid function. If your thyroid gland is under active, this can cause a drop in body temperature, while an overactive thyroid gland can increase body temperature.
An under active thyroid gland (hypothyroidism) is an incredibly common problem and many people live for years with an undiagnosed sluggish thyroid. The most common symptoms of hypothyroidism include inability to lose weight, fatigue, depression, dry skin, scalp hair loss and fluid retention. If any of these symptoms are familiar, you may want to try this test.
Instructions for performing the thyroid temperature test
- It is preferable to use a mercury thermometer. Clean the thermometer with cool, soapy water. Gripping the end opposite the bulb, shake the thermometer down until it reaches 35 degrees Celsius (95 degrees Fahrenheit) or lower. Place the thermometer beside your bed within easy reach, so that you can pick it up while still lying down the next morning.
- The next morning, as soon as you wake up, place the thermometer in your armpit, so that the bulb is in your armpit. Make sure that there is no clothing between your armpit and the thermometer. Hold the thermometer there for ten minutes and continue lying still.
- Write down your temperature. You must do this for four consecutive days.
Your temperature must be taken as soon as you wake up in the morning; before you have moved out of bed, eaten or had anything to drink. This way you will be recording your lowest temperature of the day. Menstruating women must perform this test starting on the second day of their cycle; this is because ovulation produces a rise in body temperature and would not give a true reading. Post menopausal women and men can perform this test at any time.
Do not do this test when you have an infection, injury or any other condition that can produce a mild fever.
A normal axillary (armpit) body temperature for adults is between 36.5 and 36.7 degrees Celsius; in the Fahrenheit scale this is 97.7 to 98.06 degrees. If your body temperature falls below 36.5 degrees Celsius or below 97.7 degrees Fahrenheit, you should see your doctor for further tests on your thyroid.
This method is not always 100 percent accurate and you should not rely on it solely. If your basal body temperature is outside of the normal range you should speak to your doctor about the full range of thyroid tests you need. See our book for detailed information about thyroid tests and natural, effective treatment for thyroid conditions.
Low body temperature doesn’t always indicate a thyroid problem
Other causes of low body temperature include iron deficiency, adrenal gland exhaustion, being underweight or mitochondrial disorders (common in chronic fatigue syndrome and autoimmune disease).
Here are some other tips for keeping your thyroid gland healthy:
- Consume adequate high quality protein. The thyroid gland requires the amino acid tyrosine in order to manufacture thyroid hormones. Tyrosine is found in protein rich foods such as red meat, fish, poultry, but also almonds, avocados, bananas and pumpkin seeds.
- If you have an under active thyroid gland, avoid consuming large quantities of goitrogens. These are substances that can suppress the thyroid gland if consumed in very large amounts. Foods rich in goitrogens include raw vegetables such as cabbage, broccoli, cauliflower and Brussels sprouts; as well as soy, millet, peanuts and corn. Cooking these foods is advisable and inactivates the majority of goitrogens.
- The majority of thyroid conditions are caused by an autoimmune disease; meaning the immune system is responsible for causing the thyroid to become either under active or over active. Research has shown that gluten intolerance can be a triggering factor in autoimmune thyroid disease. Gluten is a protein found in wheat, rye, oats, spelt, kamut and barley. Many thyroid patients benefit from following a gluten free diet.
- Ensure you have a healthy liver. The liver is the main site of conversion of thyroid hormone (T4) into its more active form (T3). A sluggish or fatty liver may impair the efficiency of this process.
- Ensure your diet contains adequate levels of beneficial fatty acids, as found in oily fish (salmon, sardines, tuna, anchovies, mackerel), raw nuts and seeds, cold pressed olive oil, avocados and organic coconut oil. These fats can reduce inflammation in autoimmune thyroid disease, and improve the health of thyroid cells.
- Minimize your exposure to the heavy metals mercury, cadmium and lead, as they can interfere with the manufacture of thyroid hormones.
- Minimize your exposure to pesticides and insecticides, chemical antiperspirants and deodorants and other toxic chemicals, as some have been linked with the formation of thyroid nodules, cancer and autoimmune thyroid disease.
- Get your doctor to examine your thyroid gland for lumps, bumps or enlargement. If any lumps are found you need to ask your doctor for an ultrasound scan of the thyroid gland.
- If you are fatigued, ask your doctor to do a blood test for thyroid function.
Make sure you are not deficient in the most critical nutrients for a healthy thyroid gland; they are vitamin D, selenium, iodine and zinc. These nutrients are all combined together in .
The above statements have not been evaluated by the FDA and are not intended to diagnose, treat or cure any disease.