How to Test Your Thyroid With a Thermometer

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How to Test Your Thyroid With A Thermometer

The thyroid is a tiny, butterfly-shaped gland which plays an important role in your well-being and health. It is located in your neck, just above your collarbone and it’s one of your endocrine glands, which make hormones that control many activities in your body. The thyroid makes sure the body’s metabolism, temperature, vitality and development are in order.

Read on to find out how to check the condition of your thyroid using a thermometer.


The Functions of the Thyroid

The thyroid gland takes iodine from the food and converts it into thyroid hormones T3 and T4. Hence, in geographic areas where iodine supply is scarce (and is not supplemented), we can often see more people with thyroid problems.

  • Triiodothyronine (T3) and thyroxine (T4) are two of the hormones the thyroid secretes and they control the metabolism.
  • The other thyroid hormone is calcitonin, which regulates calcium levels in the blood and bones.
  • The thyroid makes sure we have sufficient energy – the first symptom telling you that something is wrong is often tiredness.
  • The thyroid is responsible for growth and development. If children don’t get enough thyroid hormones when they’re growing up, this can result in brain abnormalities and lower IQ.

Normally, the thyroid is not visible or palpable. When its function is disturbed, the gland can become abnormally enlarged – this is known as goiter.

According to the American Thyroid Association more than 12% of the U.S. population will develop a thyroid condition during their lifetime, and these are many millions of people.


Hypothyroidism is a condition where the thyroid gland is under-active and doesn’t produce enough of its hormones.

A person can already be born with a gland deficiency, or the condition can develop later due to autoimmune causes (such as Hashimoto’s thyroiditis), radiation therapy and certain medications, or too little iodine in the diet.

Limited production of thyroid hormones can limit the full function of almost every part of your body.


Richard L.Shames,MD, and Karilee Shames RN, Phd authors of the Thyroid Mind Power estimate that 50 million Americans may have low level of thyroid hormones.

The main symptoms of hypothyroidism include:

  • High TSH levels
  • Unexplained weight gain
  • Constipation
  • Depression
  • Fatigue
  • Pale dry skin
  • Baldness
  • Increased sensitivity to cold

Doctors diagnose hyperthyroidism by testing TSH (thyroid stimulating hormone) levels in addition to the blood test results of T4 and T3 levels. Low TSH levels usually mean that you suffer from hypothyroidism and your thyroid is producing too much T3 and T4 thyroid hormones.

For a detailed list of symptoms, read my post about the top 13 signs you have a thyroid disorder.

Why it’s Hard to Detect Hypothyroidism

According to Jacob Teitelbaum MD and Bill Gotlib CHC authors of the Real Cause Real Cure, most doctors don’t know about research showing that the TSH test (a test for evaluating thyroid function and/or symptoms of a thyroid disorder) is unreliable.


Dr. Teitelbaum adds that over the decades these tests have been continually updated with ever expanding definitions of who is and isn’t hypothyroid. He says that there is no reason to believe that the current test effectively detects every case of hypothyroidism.

In 2002 the American Association of Clinical endocrinologists (AACE) revised the normal range for TSH test (0.5 to 5.0) stating that anyone with a TSH of over 3.0 is hypothyroid. This means that approximately 13 million Americans with ranges from 3.1 to 5.0 had not been treated for hypothyroidism because their lab results regarded as normal.

The American Association of Clinical Endocrinologists estimated that the new guidelines actually double the number of people who have abnormal thyroid function.

The Thyroid Armpit Test

This test is recommended by Dr. Teitelbaum for anyone who suffers from several of the symptoms of hypothyroidism.

Because the thyroid gland reflects the body’s metabolic rate and heat is generated during metabolism, your body temperature can give clues regarding the function of the thyroid gland.


If you suspect that you suffer from hypothyroidism then a self test using a thermometer can provide more evidence.

How to Test Your Thyroid with a Thermometer

In order to do this test you will need to have a basal thermometer (like this one). A basal thermometer is a very sensitive thermometer that measures temperature changes more closely than a regular thermometer. You can purchase a basal thermometer at almost any drugstore or online.

  • Keep a basal thermometer beside your bed.
  • Check your armpit (axilla) temperature for several days in the morning when you wake up. Before getting out of bed put the thermometer in your armpit.
  • Lie quietly for 10 minutes

According to Dr. Teitelbaum, if your temperature is under 97.4 degrees Fahrenheit (36.33 degrees Celsius) on two repeat measurements, you and your doctor should consider treatment with thyroid hormone.

In his own practice, Dr. Teitelbaum asks patients with thyroid symptoms to take oral temperature between 11:00 a.m. and 7:00 p.m. on two different days. If it’s regularly below 98.1 degrees Fahrenheit (36.72 degrees Celsius) he treats the person for hypothyroidism.

For women, who are still menstruating, the test should be done on the second, third, and fourth days of the menstrual cycle. The reason is because a considerable temperature rise may occur around the time of ovulation and give incorrect results. Post-menopausal women or men can conduct the tests any days of the month.

The test is not to be used as a replacement for a proper medical assessment.  Instead it can help you determine whether you may have a thyroid imbalance and a low functioning thyroid gland in particular.

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13 Responses to How to Test Your Thyroid With a Thermometer

  1. Marty says:

    What if your body temperature is normally lower than the average? Mine has always been between 94.5 to 96 all my life. I have a sensitivity to heat not the cold. Upper 70’s to very low 80’s outside feels very hot to me.

  2. Karen says:

    Mine is low. When I did the thyroid test, it was under 97. Saw three docs (including a so-called specialist) and all three said I didn’t have any issues. One took only the TSH test (I told him it would come back normal, which it did), and the other took the T3/T4, which came back normal. Actually, none of the docs were even interested in the temps or symptoms I had. Sort of blew me off. So, I gave up and now just deal with it.

  3. Bonnie Foote says:

    My thyroid is dead because of a hepatitis treatment I took. Is there anything I should be doing other than taking levothyroxin? Also I’m noticing my thyroid is swelling on the right then the left side. What should I do?

    • Jenny says:

      Hi Bonnie, I’m not really sure about your condition. Hormonal issues are a specialized area and I lack the required knowledge (I’m not a doctor). This is something to discuss with an endocrinologist. I apologize I cannot be of any help.

    • Denise says:

      Hi Bonnie, mine hyper-thyroid and have been struggle for year, I have done a lot of research trying hard to cure my thyroid and eventually I’ve found one that really help me! 3mths ago I can see swelling on my neck and now it has gone! Try Moringa, it helps on thyroid disorder of cos am still under the medication but had been reduced by taking only once a day and Moringa has now played very important part on my thyroid ! lol

    • lisa mcgrath says:

      Hi Bonnie, was the treatment interferon and ribavirin? Do you fluctuate between hypothyroidism and hyperthyroidism?

  4. bj. tucker says:

    Iam losing my hair in top it got me upset,iam tied of wearing wig iwant to were my own hair. What can i do, for my hair to grow back,iam 60 year old.

    • Jenny Hills says:

      The first step is to identify what causes your hair loss – is it hormonal issue? medical condition? or something else? – you can find more about it in my article about 10 reasons for hair loss. After finding the root of the problem and taking care of it if possible, you can combine it with one of the methods to encourage hair growth. These methods are not a quick fix, and patience is required. Also results vary between different people.

  5. sabina says:

    I used bugleweed and motherwort when I had Grave’s disease over 10 years ago. Gone, now.

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