Endocrinology deals with the study of the endocrine system, including the biochemical and physiological functions of the hormones, cells, and tissues of the endocrine glands. Endocrine disorders can be broadly subdivided into three categories: endocrine gland hyposecretion, which causes hormone deficiency, endocrine gland hypersecretion, which causes excess hormone secretion, and tumors in the endocrine gland. The endocrine disorders considered for the present report include diabetes, human growth hormone deficiency, thyroid disorders, and male hypogonadism.