Endocrinology is a division of medicine that focuses on the function of hormones and their effects on the body. Hormones are chemical substances released by endocrine glands in the body to regulate various functions of different organs in the body such as metabolism, respiration, reproduction, sensory perception, and movement. It is a way of communication between cells that influences tissue and organ function to respond to different situations and maintain a stable physiology. Hormones influence many physiological activities such as growth, puberty, appetite, sugar regulation and level of alertness. Endocrinology is dedicated to the diagnosis and treatment of various diseases caused by the imbalance in hormones, such as diabetes, thyroid problems, sexual problems, obesity, bone problems, few neurological problems and cancer.