Hypopituitarism | UCLA Health
Posted: October 7, 2018 at 4:41 am
Definition: Hypopituitarism is a condition caused by low levels of pituitary hormones.
Alternative Names: Pituitary insufficiency
Causes, incidence, and risk factors: The pituitary gland is a small structure that is located just below the brain. It is attached by a stalk to the hypothalamus, the area of the brain that controls its function.
The hormones secreted by the pituitary gland (and their functions) are:
In hypopituitarism, there is an absence of one or more pituitary hormones. Lack of the hormone leads to loss of function in the gland or organ that it controls. For example, loss of thyroid stimulating hormone leads to loss of function in the thyroid gland.
Hypopituitarism may be caused by tumors of the pituitary gland or hypothalamus, head trauma, brain tumor, radiation, brain surgery, stroke, subarachnoid hemorrhage (from a burst aneurysm), or infections of the brain and the tissues that support the brain. Occasionally, hypopituitarism is due to uncommon immune system or metabolic diseases, such as sarcoidosis, histiocytosis X, and hemochromatosis.
Hypopituitarism is also a rare complication following pregnancy, a condition called Sheehan's syndrome. The cause of this type of hypopituitarism is unknown.
Symptoms:
Note: Symptoms may develop slowly and may vary greatly, depending upon the severity of the disorder, the number of deficient hormones, and their target organs.
Additional symptoms that may be associated with this disease:
Signs and tests:
Diagnosis of hypopituitarism must confirm low hormone levels due to an abnormality of the pituitary gland. The diagnosis must also rule out disease of the organ affected by this hormone.
In some cases, one of the hormones produced by the pituitary may be elevated in the blood stream if a patient has a pituitary tumor which is producing an excessive amount of that hormone. The tumor itself may be crushing the rest of the cells of the pituitary, leading to low levels of other hormones.
Treatment: If hypopituitarism is caused by a tumor, treatment by surgical removal, with or without radiation therapy, may be indicated. Replacement of deficient hormones is often required even after successful treatment of a pituitary tumor.
Hormone therapy is needed to replace hormones that are no longer made by the organs under the control of the pituitary gland. These may include corticosteroids (cortisol), thyroid hormone, sex hormones (testosterone for men and estrogen for women), and growth hormone. Drugs are also available to treat associated infertility in men and women.
Support Groups:
Expectations (prognosis): Hypopituitarism is usually permanent and requires life-long treatment; however, a normal life span can be expected.
Complications: Side effects of drug therapy can develop.
Calling your health care provider: Call your health care provider if symptoms of hypopituitarism develop.
Prevention: In most cases, the disorder is not preventable. Awareness of risk may allow early diagnosis and treatment.
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Hypopituitarism | UCLA Health
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