Final answer:
An endocrinologist is a medical doctor who specializes in treating disorders of the endocrine glands. They manage conditions such as diabetes mellitus, acromegaly, goiter, and Cushing's disease.
Step-by-step explanation:
An endocrinologist is a medical doctor who specializes in treating disorders of the endocrine glands, hormone systems, and glucose and lipid metabolic pathways. They are experts in managing diseases such as diabetes mellitus, acromegaly, goiter, and Cushing's disease. Another specialist in this field is an endocrine surgeon, who performs surgical treatments for endocrine diseases and glands.