Hypopituitarism

Hypopituitarism is a condition where the pituitary gland, a small but crucial part of the brain, does not produce enough of certain important hormones. These hormones control many body functions, including growth, metabolism, and reproduction. When the pituitary gland fails, it can cause symptoms like fatigue, weakness, weight changes, and problems with sexual function. The condition affects the endocrine system, which regulates hormone levels throughout the body. Because hormones influence many organs, hypopituitarism can lead to widespread health issues. Early diagnosis is important to manage symptoms and prevent complications.

Hypopituitarism is defined as the partial or complete deficiency of one or more anterior or posterior pituitary hormones due to impaired pituitary function. The core pathology involves destruction or dysfunction of the anterior pituitary, often caused by pituitary adenomas, ischemic necrosis (e.g., Sheehan syndrome), infiltrative diseases, or traumatic injury. This leads to decreased secretion of hormones such as growth hormone (GH), adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), and follicle-stimulating hormone (FSH). The clinical significance lies in the resultant secondary hormone deficiencies, causing symptoms like adrenal insufficiency, hypothyroidism, and hypogonadism. Posterior pituitary involvement may cause diabetes insipidus due to antidiuretic hormone (ADH) deficiency. Untreated hypopituitarism can result in life-threatening complications, including adrenal crisis.