Endocrinology is the study of hormones. Hormones are essential for our every-day survival. They control our temperature, sleep, mood, stress, growth and more.
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An endocrinologist is a doctor that treats diseases related to problems with hormones. A hormone is a chemical messenger that travels from one cell to another. Hormones are released in one part of the body, travel in the blood stream and have an effect on other part of the body. This helps different parts of the human body to communicate with each other. Hormones are secreted by endocrine glands, such as the pituitary, thyroid or adrenal glands. Not all glands are classified as endocrine glands; for example, sweat glands or lymph glands are not endocrine glands.