The adrenal gland is one of the most important endocrine glands in the body, located above the kidney, one on each side, triangular on the right side and semicircular on the left side. Cells in the globular zone secrete salt corticosteroids, such as aldosterone. Cells in the fasciculus secrete glucocorticoids, such as cortisol. Reticular zone cells secrete mainly sex hormones such as dehydroepiandrosterone or estradiol, and may also secrete small amounts of glucocorticoids. The adrenal cortex plays a very important role in regulating water and salt metabolism, as well as sugar and protein metabolism. The adrenal medulla produces epinephrine and norepinephrine, which have the effect of accelerating the heart rate and raising blood pressure, making the adrenal gland a very important endocrine organ in the body. There are more patients with clinical adrenal lesions, such as central obesity, full-moon face, buffalo back, and purple lines on the skin, which may be caused by excessive secretion of cortisol from the adrenal cortex, and patients may develop significant hypertension. The adrenal medulla secretes adrenaline and norepinephrine, which may cause pheochromocytoma. Such patients may have significant hypertension, with systolic blood pressure reaching 200 mmHg and even diastolic blood pressure reaching over 120 mmHg.