The adrenal glands are two small, triangular glands that sit on top of the kidneys. They produce several hormones, including cortisol (the main stress hormone), adrenaline, and aldosterone, which help the body handle stress and regulate blood pressure, blood sugar, and metabolism.
You may see the term "adrenal fatigue" online — it's worth knowing that this is not a recognized medical diagnosis. Genuine adrenal disorders, such as the prolonged cortisol excess of Cushing's syndrome, are uncommon and diagnosed with proper testing. For everyday stress, see how to lower cortisol.