The thyroid is a butterfly-shaped gland located in the front of the neck, just above the collarbone. Although small, it plays a very important role in the body because it produces hormones that help regulate many essential functions.

Thyroid hormones influence metabolism, energy levels, body temperature, and even heart rate. When the thyroid is not working properly, it can affect the entire body.

The two most common thyroid disorders are hypothyroidism and hyperthyroidism.

Hypothyroidism happens when the thyroid works too slowly and does not produce enough hormones. Common symptoms may include tiredness, depression, weight gain, pale skin, constipation, and increased sensitivity to cold.

Hyperthyroidism, on the other hand, occurs when the thyroid becomes overactive and produces too many hormones. Frequent symptoms may include nervousness, insomnia, and weight loss. This condition is more common in women than in men and, in some cases, may affect fertility or pregnancy. Some people with hyperthyroidism may also notice more prominent or wider-looking eyes.

Because thyroid problems can sometimes develop gradually, many people may not realize there is an issue. For that reason, some experts have suggested simple at-home methods that may help you notice possible warning signs. However, it is important to remember that this does not replace a medical diagnosis.

One popular home method involves checking your basal body temperature with a thermometer. The idea behind this method is that the thyroid helps control metabolism, and metabolism generates heat. As a result, body temperature may sometimes offer clues about how the thyroid is functioning.

To try this method, place a thermometer next to your bed before going to sleep. In the morning, as soon as you wake up, place the thermometer under your armpit before getting out of bed, eating, drinking, talking, or doing any activity. Leave it there for about 10 minutes.

Afterward, check the temperature reading. Some people believe that a reading between 36.5°C and 36.8°C may suggest normal thyroid function. A lower reading may be associated with a slower metabolism, while a higher reading could suggest a faster metabolism, unless there is another reason such as infection or fever.

For more consistent results, this method is often repeated for four consecutive days. Women who menstruate are sometimes advised to avoid testing during ovulation, since body temperature can naturally rise at that time.

While this method may be interesting as a general self-check, it is not a reliable way to diagnose a thyroid disorder. If you often experience symptoms such as fatigue, unexplained weight changes, anxiety, sleep problems, sensitivity to cold or heat, or changes in heart rate, the best step is to speak with a doctor. Proper thyroid testing usually requires blood tests and a professional medical evaluation.