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Hypopituitarism

  • Definition
    • Hypopituitarism is a condition in which the pituitary gland does not produce normal amounts of some or all of its hormones.

  • Alternative Names
    • Pituitary insufficiency

  • Causes
    • The pituitary gland is a small structure that is located just below the brain. It is attached by a stalk to the hypothalamus. The hypothalamus is the area of the brain that controls the pituitary gland's function.

      The hormones released by the pituitary gland (and their functions) are:

      • Adrenocorticotropic hormone (ACTH) -- stimulates the adrenal gland to release cortisol; cortisol helps to maintain blood pressure and blood sugar
      • Antidiuretic hormone (ADH) -- controls water loss by the kidneys
      • Follicle-stimulating hormone (FSH) -- controls sexual function and fertility in males and females
      • Growth hormone (GH) -- stimulates growth of tissues and bone
      • Luteinizing hormone (LH) -- controls sexual function and fertility in males and females
      • Oxytocin -- stimulates the uterus to contract during labor and the breasts to release milk
      • Prolactin -- stimulates female breast development and milk production
      • Thyroid-stimulating hormone (TSH) -- stimulates the thyroid gland to release hormones that affect the body's metabolism
      Pituitary gland

      In hypopituitarism, there is a lack of 1 or more pituitary hormones. Lack of a hormone leads to loss of function in the gland or organ the hormone controls. For example, lack of TSH leads to loss of normal function of the thyroid gland.

      Hypopituitarism may be caused by:

      • Brain surgery
      • Brain tumor
      • Head trauma (traumatic brain injury)
      • Infections or inflammation of the brain and the tissues that support the brain
      • Death of an area of tissue in the pituitary gland (pituitary apoplexy)
      • Radiation therapy to the brain
      • Stroke
      • Subarachnoid hemorrhage (from a burst aneurysm)
      • Tumors of the pituitary gland or hypothalamus

      Sometimes, hypopituitarism is due to uncommon immune system or metabolic diseases, such as:

      Hypopituitarism is also a rare complication after pregnancy of a condition called Sheehan syndrome.

  • Symptoms
  • Exams and Tests
  • Treatment
    • If hypopituitarism is caused by a tumor, you may need surgery to remove the tumor. Radiation therapy may also be needed.

      You will need lifelong hormone medicines to replace hormones that are no longer made by organs under the control of the pituitary gland. These may include:

      • Corticosteroids (cortisol)
      • Growth hormone
      • Sex hormones (testosterone for men and estrogen for women)
      • Thyroid hormone

      Drugs are also available to treat related infertility in men and women.

  • Outlook (Prognosis)
    • Hypopituitarism is usually permanent. It requires lifelong treatment with 1 or more medicines. But you can expect a normal life span.

  • Possible Complications
    • Side effects of medicines can develop. Stopping corticosteroid and thyroid supplementation can be life threatening.

  • When to Contact a Medical Professional
    • Call your health care provider if you develop symptoms of hypopituitarism.

  • Prevention
    • In most cases, the disorder is not preventable. Awareness of risk may allow early diagnosis and treatment.

  • References
    • Burt MG, Ho KKY. Hypopituitarism and growth hormone deficiency. In: Jameson JL, De Groot LJ, de Kretser DM, et al, eds. Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 11.

      Clemmons DR, Nieman LK. Approach to the patient with endocrine disease. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 221.