Your adrenals and thyroid work in harmony with each other. Many books on adrenals list all the symptoms of low thyroid as adrenal problems and vice versa. There are differences. Morning energy, stress tolerance, and aerobic fitness are primarily adrenal issues. Thyroid issues are more about afternoon energy level, being too cold, and feeling mentally sluggish or heavy headed (adrenals issues go more with brain fog).

Thyroid sets your basic supply of energy for your body to use. Not having enough automatically stresses your adrenals if there is an increased demand for needed energy. Conversely, tired adrenals make it so your body ...