Understanding the stress hormone's impact on metabolism, sleep, immunity, and overall health
High cortisol levels can have a variety of causes. A tumor or growth in the pituitary gland, called Cushing disease, can cause excess cortisol production, as can tumors in the adrenal glands, lungs, or thyroid. Steroid medications, including oral medications, injections, nebulizers, and creams, can also increase cortisol. Chronic stress, insufficient sleep, working night shifts, and a lack of exercise may also contribute to elevated cortisol.

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