Thyroid Conditions
Thyroid conditions can also cause heat intolerance. They are more common in women than men and can cause a lack of heat tolerance. The thyroid gland is located in the neck, just below the Adam’s apple, releasing hormones that control the body’s metabolic rate.
As the body temperature rises during exercise, more sweating is needed to cool a person’s core temperature down again. However, this may not be possible if they have an overactive or underactive thyroid gland. It increases the likelihood of developing heat intolerance symptoms when exercising or competing outdoors on hot days where environmental temperatures already exceed body temperature levels by 20 degrees Fahrenheit (11 degrees Celsius).
The thyroid gland produces two main hormones: triiodothyronine (T3) and thyroxine (T4). These hormones control the body’s metabolic rate and the speed at which the body burns calories. When the thyroid gland releases too much T3 or T4, this can cause sweating that does not stop even after exercise.
