What condition is characterized by excessive secretion of insulin leading to hypoglycemia?

• A. Insulinoma
• B. Diabetes Mellitus
• C. Hypopituitarism
• D. Cushing's Syndrome

Answer: (A)

The condition characterized by excessive secretion of insulin leading to hypoglycemia is insulinoma. Insulinoma is a rare pancreatic tumor that secretes insulin regardless of the body's needs, resulting in abnormally high levels of insulin in the blood. This overproduction of insulin can cause the blood glucose levels to plummet, leading to hypoglycemic episodes, which may present with symptoms such as sweating, confusion, irritability, and in severe cases, loss of consciousness.

In contrast, diabetes mellitus is characterized by insufficient insulin production or ineffective use of insulin, resulting in high blood sugar levels rather than hypoglycemia. Hypopituitarism affects the secretion of multiple hormones from the pituitary gland but does not directly cause excessive insulin production. Cushing's syndrome involves elevated cortisol levels, which leads to increased blood glucose levels, further deviating from the mechanism of insulinoma. Thus, insulinoma stands out as the correct choice for this question.