Pituitary disorders
medical conditions

Pituitary disorders

Explore the available health information, treatment context, and integrative evidence for Pituitary disorders.

Background
  • Pituitary disorders occur when the pituitary gland produces too many or not enough hormones. Hormones are chemicals that are released into the bloodstream. It is important that the body releases normal amounts of hormones because they send messages to cells throughout the body in order to regulate bodily functions, such as growth, metabolism, and sexual development.
  • The pituitary gland is a pea-sized gland that is located at the base of the brain. It is just one of many glands involved in the endocrine system. The endocrine system is made up of several glands throughout the body that produce and secrete hormones.
  • Many experts consider the pituitary gland to be the most important part of the endocrine system because it secretes hormones that regulate the functions of many other endocrine glands. As a result, patients with pituitary disorders may experience a disruption in many different bodily functions.
  • The pituitary gland secretes several different hormones that are important for normal bodily functions. Growth hormone (GH) regulates bone and tissue growth. It also helps maintain a healthy balance of muscle and fat tissue in the body. Anti-diuretic hormone (ADH) helps control urine production and manages the water balance in the body. Thyroid-stimulating hormone (TSH) signals the thyroid gland to secrete other hormones that regulate the body's metabolism. Luteinizing hormone (LH) regulates testosterone production in males and estrogen production in females. Follicle-stimulating hormone (FSH) signals sperm production in males and egg development and ovulation in females. Adrenocorticotropic hormone (ACTH) stimulates the adrenal glands to produce other hormones, such as cortisol. Prolactin regulates the development of breasts and breast milk in females. Although low levels of prolactin are present in males, there is no known function of prolactin in males.
  • If the pituitary gland releases too many hormones, disorders, such as acromegaly, Cushing's disease, or hyperprolactinemia, may develop. If the pituitary gland does not release enough hormones, patients develop a condition called hypopituitarism. Most pituitary disorders occur when a noncancerous tumor (abnormal growth) develops on the pituitary gland. A tumor may stimulate the gland to produce too many or not enough hormones.
  • Treatment of pituitary disorders depends on the type and severity of the disorder. In general, tumors of the pituitary gland need to be surgically removed. Sometimes the entire tumor cannot be removed. In such cases, patients may also need radiation or drug therapy. Even if the tumor is removed, some patients with overactive or underactive pituitary glands may require long-term hormone replacement therapy.
Signs and Symptoms
  • Acromegaly: Symptoms of acromegaly develop gradually over many years. The most common symptom of acromegaly is enlarged hands and feet. It may also lead to gradual changes in the shape of the face, such as an enlarged nose, thickened lips, increased gaps between the teeth, or protruding lower jaw or brow.
  • Other symptoms may include coarse or oily skin, increased sweating, body odor, fatigue, muscle weakness, small outgrowths of skin tissue (called skin tags), deepened voice, severe snoring, enlarged tongue, joint pain, limited joint mobility, increased chest size, enlarged organs (e.g. heart, kidneys, and spleen), irregular menstrual cycle in women, and erectile dysfunction in men. If a tumor is causing the condition and pushing on the brain, patients may experience frequent headaches or impaired vision.
  • Serious complications of acromegaly may include high blood pressure, heart disease, and spinal cord compression that causes severe pain.
  • Cushing's disease: Common symptoms of Cushing's disease include weight gain (especially around the midsection and upper back), a fatty hump between the shoulders (called a buffalo hump), fatigue, muscle weakness, rounded face (often called moon face), facial flushing, thin and fragile skin that bruises easily, depression, anxiety, irritability, thicker or more visible body and facial hair (hirsutism), irregular or absent menstrual periods in females, erectile dysfunction in males, high blood pressure, acne, as well as stretch marks on the skin of the abdomen, thighs, breasts, and arms.
  • Cushing's disease may be fatal if left untreated. Severe symptoms may include high blood pressure, bone loss, kidney stones, infections, and, sometimes, diabetes.
  • Hyperprolactinoma: Symptoms of hyperprolactinoma depend on the severity of the condition and the gender of the patient. Both males and females may develop symptoms, such as decreased libido, headaches, impaired vision, infertility, and low bone density.
  • Common symptoms in females include irregular menstrual periods, lack of menstrual periods (called amenorrhea), discharge from the breasts in women who are not pregnant or breastfeeding, and vaginal dryness.
  • Common symptoms in males include erectile dysfunction, impotence, and loss of body hair. In rare cases, some males may develop enlarged breasts (a condition called gyncomastia).
  • Hypopituitarism: Signs and symptoms of hypopituitarism depend on the hormone that is deficient.
  • Symptoms of adrenocorticotropic (ACT) hormone deficiency may include fatigue, low blood pressure, weight loss, weakness, depression, nausea, and vomiting.
  • Symptoms of thyroid-stimulating hormone (TSH) deficiency may include constipation, weight gain, sensitivity to cold, decreased energy, and muscle weakness, or aching.
  • Symptoms of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) deficiency include irregular or stopped menstrual periods and infertility in women. Men may experience loss of body and facial hair, weakness, decreased libido, erectile dysfunction, and infertility.
  • Symptoms of growth hormone (GH) deficiency in children may include short height, fat around the waist, chubby face, and poor overall growth. In adults, symptoms may include low energy, decreased strength and exercise tolerance, weight gain, decreased muscle mass, and feelings of anxiety or depression.
  • Symptoms of prolactin deficiency in women may include lack of milk production, fatigue, and loss of underarm and pubic hair. Prolactin deficiency has no known adverse effects in men and no symptoms have been seen.
  • Anti-diuretic hormone (ADH) deficiency causes diabetes insipidus. Diabetes insipidus is a disorder in which the kidneys are unable to store water. As a result, patients experience increased thirst and urination.
Diagnosis
  • Acromegaly: The standard diagnostic test for acromegaly is a growth hormone suppression test. During the procedure, a sample of blood is taken from the patient before and after he/she drinks a special fluid made with sugar (called glucose). In healthy individuals, the sugar will cause the levels of growth hormone to decrease. However, patients with acromegaly will continue to have high levels of growth hormone even after consuming sugar.
  • Cushing's disease: Patients with high levels of cortisol in the body are diagnosed with Cushing's disease. Urine, blood, and saliva tests are conducted to determine if the patient has elevated levels of cortisol in the body. Patients who have excessive cortisol levels will then undergo body scans that produce pictures of their internal organs (called imaging studies) to determine if a tumor inside the body is causing the condition.
  • Hyperprolactinemia: Patients with hyperprolactinemia will have high levels of prolactin in their blood. Other tests usually include computerized tomography (CT) scans or magnetic resonance imaging (MRI) scans of the brain. These imaging studies will help the healthcare provider determine if a tumor is causing the condition. Healthcare providers usually suspect that the condition is drug-induced if the patient is taking a medication known to suppress dopamine levels. Healthcare providers may also perform a blood test to determine if the patient has low levels of thyroid hormones, which may also cause hyperprolactinemia.
  • Hypopituitarism: Blood tests are used to diagnose hypopituitarism. Patients with low or non-existent levels of one or more hormones have the condition. In addition, imaging studies, including CT scans and MRI scans, may be used to detect tumors or abnormalities in the pituitary gland.
Complications
  • General: If a tumor is causing the pituitary disorder, it will need to be surgically removed. Sometimes, the entire tumor cannot be removed because there may be a high risk of damaging the internal organs that the tumor is growing on. In such cases, patients may also need radiation or drug therapy. Some patients with either acromegaly or hypopituitarism may require long-term hormone replacement therapy.
  • Patients should tell their healthcare providers if they are taking any other drugs (prescription or over-the-counter), herbs, or supplements because they may interact with treatment. Patients should take all medications exactly as prescribed.
  • Surgery: Surgery may be performed to remove tumors that are causing the pituitary disorder. Once the tumor is removed, the levels of hormones in the body usually return to normal or near-normal. Drug therapy may also be needed after surgery.
  • In most cases, a surgical procedure, called transsphenoidal surgery, is performed to remove the tumor. During this procedure, the surgeon removes the pituitary gland through the nose. This type of surgery has fewer complications because other parts of the brain are not touched during the procedure.
  • However, some patients, especially those who have very large tumors, may need to have transcranial surgery. During this type of surgery, the pituitary tumor is removed through part of the skull.
  • Radiation therapy: Sometimes the surgeon is unable to remove the entire tumor. In such cases, radiation therapy is often recommended to remove the rest of the tumor. During therapy, which usually lasts several weeks, high-energy waves are used to kill the tumor cells. However, many pituitary tumors recur within five years after surgical removal.
  • Dopamine agonists: Patients with hyperprolactinemia may receive medications called dopamine agonists. These medications act like the brain chemical dopamine, which regulates the production of prolactin. Dopamine agonists, such as bromocriptine (Parlodel®) and cabergoline (Dostinex®), help reduce the amount of prolactin that is produced. They may reduce symptoms of the disorder and reverse infertility. If the dopamine agonist effectively shrinks the tumor, patients may be able to stop taking the medication. Patients will need to have their prolactin levels monitored regularly.
  • Side effects may include dizziness, nausea, stuffy nose, and difficulty concentrating. The risk of side effects is reduced if patients start treatment with low doses that are gradually increased over time.
  • Octreotide: Adults with acromegaly or children with gigantism may receive injections of synthetic hormones, such as octreotide (Sandostatin® or Sandostatin LAR®), to reduce the amount of growth hormone that is released. Patients typically receive a short-acting injection to determine if the medication is safe and effective in the patient. If it is successful, patients will receive injections once a month for life.
  • Growth hormone antagonists: If other treatments are unsuccessful, patients with acromegaly or gigantism may take medications called growth hormone antagonists that block the effect of growth hormone on body tissues. Medications, such as pegvisomant (Somavert®), are injected into the patient. Although this treatment reduces symptoms, it does not lower the amount of growth hormone in the blood, and it does not reduce the size of the tumor.
  • Corticosteroids: Corticosteroids such as hydrocortisone or prednisone, may be taken by mouth to replace the adrenal hormones that are not being produced because of an adrenocorticotropic hormone (ACTH) deficiency.
  • Thyroid hormones: Man-made hormones, such as levothyroxine (Levoxyl® or Synthroid®) or liothyronine (Cytomel®), may be taken by mouth to replace low levels of thyroid hormones caused by thyroid-stimulating hormone (TSH) deficiencies. Patients take this medication daily with food. In addition, some patients may take dessicated thyroid (Armour® Thyroid), also called thyroid extract. Dessicated thyroid is made from pig or cow thyroid hormones.
  • Sex hormones: Patients with low levels of follicle-stimulating hormone (FSH) or luteinizing hormone (LH) may receive man-made sex hormones. Females receive a combination of estrogen and progesterone, while males receive testosterone.
  • Desmopresin: Patients with anti-diuretic hormone (ADH) deficiency may take a man-made hormone, called desmopresin (DDAVP®), by mouth or nasal spray.
  • Growth hormone: Patients with low levels of growth hormone (GH) may receive injections with a man-made growth hormone called somatropin (Genotropin®).
Prevention
  • In general, most cases of pituitary disorders cannot be prevented.
  • Patients should use certain medications, including tranquilizers (such as Stelazine®), gastroesophageal reflux disease (GERD) drugs (such as Reglan®), and high blood pressure drugs (such as Aldomet®), cautiously. These medications may lead to hyperprolactinemia.
References

Natural Standard developed the above evidence-based information based on a thorough systematic review of the available scientific articles. For comprehensive information about alternative and complementary therapies on the professional level, go to www.naturalstandard.com. Selected references are listed below.

  • Biermasz NR, Smit JW, Pereira PM, et al. Acromegaly caused by growth hormone-releasing hormone-producing tumors: long-term observational studies in three patients. Pituitary. 2007 May 31; [Epub ahead of print.] . View Abstract
  • Cortet-Rudelli C, Sapin R, Bonneville JF, Brue T. Etiological diagnosis of hyperprolactinemia. Ann Endocrinol (Paris). 2007 Jun;68(2-3):98-105. Epub 2007 May 23. . View Abstract
  • Endocrine and Metabolic Diseases Information Service. .
  • Gsponer J, De Tribolet N, Deruaz JP, et al. Diagnosis, treatment, and outcome of pituitary tumors and other abnormal intrasellar masses. Retrospective analysis of 353 patients. Medicine (Baltimore). 1999 Jul;78(4):236-69. . View Abstract
  • Natural Standard: The Authority on Integrative Medicine. .
  • Pituitary Network Association. .
  • Sata A, Ho KK. Growth hormone measurements in the diagnosis and monitoring of acromegaly. Pituitary. 2007 Jun;10(2):165-172. . View Abstract
  • Sathyapalan T, Lowry M, Turnbull LW, et al. Mechanism of action of octreotide in acromegalic tumours in vivo using dynamic contrast-enhanced magnetic resonance imaging. Pituitary. 2007 May 31; [Epub ahead of print.] . View Abstract