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         Hyperparathyroidism:     more books (71)
  1. The Official Patient's Sourcebook on Hyperparathyroidism: A Revised and Updated Directory for the Internet Age by Icon Health Publications, 2002-08
  2. Hyperparathyroidism: Webster's Timeline History, 1925 - 2007 by Icon Group International, 2009-02-20
  3. Hyperparathyroidism (Modern Surgical Monograph) by E. Paloyan, etc., 1974-03-04
  4. Primary Hyperparathyroidism by J. Barbier, 1993-07
  5. Surgical treatment of hyperparathyroidism: With an analysis of 267 cases (Medical series, nr. 219) by H. A Bruining, 1971
  6. Hyperparathyroidism - A Medical Dictionary, Bibliography, and Annotated Research Guide to Internet References by ICON Health Publications, 2004-10-08
  7. Parathyroid Disorders: Hyperparathyroidism, Parathyroid gland, Hypoparathyroidism, Parathyroid disease, Secondary hyperparathyroidism
  8. Low vitamin D can mask hyperparathyroidism: ever since food began to be fortified with vitamin D, the manifestations of pHPT have become less severe.(Metabolic ... An article from: Family Practice News by Jeff Evans, 2007-02-15
  9. 21st Century Complete Medical Guide to Parathyroid Disorders, Hyperparathyroidism, Hypoparathyroidism, Authoritative Government Documents, Clinical References, ... for Patients and Physicians (CD-ROM) by PM Medical Health News, 2004-06
  10. Primary Hyperparathyroidism
  11. Primary Hyperparathyroidism of Post-Menopausal Women: Prospective Population-Based Case-Control Analysis on Prevalence, Clinical Findings and Treatment ... Summaries of Uppsala Dissertations, 820) by Ewa Lundgren, 1999-09
  12. Hyperparathyroidism guidelines get an update.(METABOLIC DISORDERS)(Report): An article from: Family Practice News by Sherry Boschert, 2009-04-15
  13. Gale Encyclopedia of Medicine: Hyperparathyroidism by Teresa Norris RN, 2002-01-01
  14. Calcimimetic agents for the treatment of secondary hyperparathyroidism.(Pharmacy news and reviews): An article from: CANNT Journal by Jennifer Dykeman, 2008-07-01

1. Hyperparathyroidism
A frequently asked questions from the National Institutes of Health. Some older information, but still Category Health Conditions and Diseases hyperparathyroidism......Primary hyperparathyroidism is a disorder of the parathyroid glands. This epubfocuses on primary hyperparathyroidism. What Are the Parathyroid Glands?
http://www.niddk.nih.gov/health/endo/pubs/hyper/hyper.htm

Primary hyperparathyroidism is a disorder of the parathyroid glands. Most people with this disorder have one or more enlarged, overactive parathyroid glands that secrete too much parathyroid hormone. In secondary hyperparathyroidism, a problem such as kidney failure makes the body resistant to the action of parathyroid hormone. This e-pub focuses on primary hyperparathyroidism.
What Are the Parathyroid Glands?
The parathyroid glands are four pea-sized glands located on the thyroid gland in the neck . Occasionally, a person is born with one or more of the parathyroid glands embedded in the thyroid, the thymus, or elsewhere in the chest. In most such cases, however, the glands function normally. Though their names are similar, the thyroid and parathyroid glands are entirely separate glands, each producing distinct hormones with specific functions. The parathyroid glands secrete parathyroid hormone (PTH), a substance that helps maintain the correct balance of calcium and phosphorous in the body. PTH regulates release of the calcium from bone, absorption of calcium in the intestine, and excretion of calcium in the urine. When the amount of calcium in the blood falls too low, the parathyroid glands secrete just enough PTH to restore the balance.

2. Endocrinology - Hyperparathyroidism - Methodist Health Care System, Houston, Tex
Methodist Health Care System gives a brief overview of this disorder and its symptoms and diagnosis.
http://www.methodisthealth.com/endocrin/hyperpar.htm

Endocrinology

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Clinical Services
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Hyperparathyroidism What is hyperparathyroidism?
Hyperparathyroidism is caused by overactive parathyroid glands. Overactive parathyroid glands produce too much parathyroid hormones, which in turn stimulate increased levels of calcium in the blood stream. The excess calcium released by the bones leads to osteoporosis and osteomalacia (both bone-weakening diseases). Other results of hyperparathyroidism are kidney stones, because of high levels of calcium excreted into the urine by the kidneys. Causes of hyperparathyroidism include benign tumors on the parathyroid glands or enlargement of the parathyroid glands. What are symptoms of hyperparathyroidism? The following are the most common symptoms of hyperparathyroidism. However, each individual may experience symptoms differently. Symptoms may include:
  • aches and pains depression abdominal pain nausea vomiting fatigue excessive urination confusion muscle weakness
The symptoms of hyperparathyroidism may resemble other conditions or medical problems. Consult a physician for diagnosis.

3. Rancocas Valley Surgical Associates - Hyperparathyroidism
hyperparathyroidism means that the parathyroid glands are producing an excess of a hormone called parathyroid hormone,
http://www.infosheet.com/surgery/parathyroid.html
Rancocas Valley Surgical Associates P.A Rancocas Medical Center
1000 Salem Road, Suite A
Willingboro, New Jersey 08046-2855
fax: (609) 877-1589
Hyperparathyroidism means that the parathyroid glands are producing an excess of a hormone called parathyroid hormone, which in turn causes elevations in the levels of calcium circulating in the bloodstream.
Primary hyperparathyroidism has become a relatively common condition, especially among the elderly. The incidence of this disease is approximately 25-28 cases/100,000 people per year. Among white women older than 60 the incidence actually approaches 190 cases/100,000 women/year.
Parathyroid function
The only role of the parathyroid in the human body is to regulate the levels of calcium in the bloodstream. Indirectly, therefore, the glands, working in unison in a normal situation, determine the strength and integrity of the bones. If there is too much calcium leached from the bones, then a condition called osteopenia and osteoporosis occurs. The parathyroid glands have no functional relationship to the thyroid gland. When the calcium levels get too high, typically above 10.5, the patient complains of abdominal pain, tiredness, irritability, depression, memory loss, and, sometimes, kidney stones. Many patients, however, have little or no complaints associated with the elevation in calcium. More often than not, today the discovery of hyperparathyroidism is associated with a routine blood test that finds an elevation in the blood calcium level.

4. Hyperparathyroidism: Overactivity Of The Parathyroid Glands.
Over 45 pages on parathyroid disease and hyperparathyroidism. Written by experts for patients. Covers the dangers, symptoms, and treatments of parathyroid hormone excess. Includes listing of physicians in your town who specialize in parathyroid
http://www.endocrineweb.com/hyperpara.html
This parathyroid page was updated February 24, 2003. The primary disease of parathyroid glands is overactivity...too much parathyroid hormone is produced. This is called hyperparathyroidism. Under this condition of hyperparathyroidism, one or more of the parathyroid glands behaves inappropriately by making excess hormone regardless of the level of calcium. In other words, the parathyroid glands continue to make large amounts of parathyroid hormone even when the calcium level is normal and they should not be making hormone at all. Remember as you read these pages, its a hormone problem, not a cancer problem. We'll say it againHyperparathyroidism is a parathyroid hormone problem, NOT a parathyroid cancer problem! HOWEVER, over-production of parathyroid hormone by over-active parathyroid glands (hyperparathyroidism) can rob you of your health, making you feel run down and tired, causing osteoporosis and many other serious problems. KEEP READINGHyperparathyroidism can be fixed with new mini-surgery techniques in under 30 minutes!

5. Parathyroid Surgery For Hyperparathyroidism
Overview of Standard Parathyroid Surgery For Primary hyperparathyroidism. MOSTpatients can have an outpatient procedure to cure hyperparathyroidism.
http://www.endocrineweb.com/standardpara.html
Overview of Parathyroid Surgery Since 1925, the gold standard treatment for primary hyperparathyroidism has been to surgically remove the parathyroid gland (or glands) which are overproducing hormone. Remember, this is a hormone problem, so the goal is to remove the source of the excess hormone (remove the bad parathyroid gland, leave the normal parathyroid glands). The ' standard parathyroid operation ' has not changed since its invention in 1925, and is performed by putting the patient to sleep under general anesthesia, an incision is made in the neck and the thyroid gland is mobilized to allow the surgeon to identify the four parathyroid glands which reside moderately deep in the neck behind the thyroid. Patients are typically hospitalized over night, and occasionally as long as a day or two. The incision has to be made of sufficient length to allow the surgeon adequate exposure of the numerous important structures in the neck, and thus it is typically five to seven (or even 10) inches long. These wounds eventually heal quite nicely. Parathyroid, parathyroid surgery, parathyroid operation

6. Hyperparathyroidism: What It Is And How It's Treated
A very brief, onepage overview of parathyroid glands. From a handout produced by the American Academy Category Health Conditions and Diseases hyperparathyroidism......hyperparathyroidism What it is and how it's treated. What is hyperparathyroidism? Whatare the symptoms of hyperparathyroidism?
http://familydoctor.org/handouts/251.html
Information
from Your Family Doctor
Hyperparathyroidism: What it is and how it's treated What is hyperparathyroidism?
You have 4 pea-sized glands behind the thyroid gland at the front of your neck. These glands are called parathyroids. They make a hormone called parathyroid hormone (PTH) that keeps the right levels of calcium in your blood and bones. PTH helps you absorb calcium from your food and keeps you from losing too much calcium in your urine. When your parathyroid glands make too much of this hormone, you have a condition called hyperparathyroidism (HPT). The amount of calcium going into your bones usually matches the amount of calcium passing out of you bones. This means that the amount of calcium in your bones should stay about the same all the time. If you have HPT, more calcium is coming out of your bones than is going in, so you get too much calcium in your blood. Other parts of your body don't work as well if you have too much calcium in your blood. What are the symptoms of hyperparathyroidism? Someone with hyperparathyroidism may experience some of the following symptoms:
  • You might feel depressed or feel tired all the time.

7. Diagnosis And Management Of Asymptomatic Primary Hyperparathyroidismhttp//text.n
When your parathyroid glands make too much of this hormone, you have a condition called hyperparathyroidism (HPT).
http://text.nlm.nih.gov/nih/cdc/www/82.html

8. New York Thyroid Center: Hyperparathyroidism
A definition of this disorder, parathyroid glands, symptoms, causes, diagnosis and treatment.Category Health Conditions and Diseases hyperparathyroidism...... hyperparathyroidism occurs when one or more of the parathyroid glands becomesenlarged and overactive, producing too much parathyroid hormone (PTH).
http://cpmcnet.columbia.edu/dept/thyroid/hyperpara.html
Related Topics: Clinical Trials for Hyperparathyroidism Parathyroid Surgery Choosing a Surgeon New York Thyroid Center Home
here are four parathyroid glands located in the neck, surrounding the thyroid gland. These glands produce parathyroid hormone (PTH) in order to keep the blood calcium level within the normal range. When blood calcium becomes too low, parathyroid hormone compensates by releasing calcium from the bones, by conserving calcium that would ordinarily be excreted by the kidneys, and by increasing absorption of calcium from food. Hyperparathyroidism occurs when one or more of the parathyroid glands becomes enlarged and overactive, producing too much parathyroid hormone (PTH). When this happens, the excess parathyroid hormone causes a high level of calcium to be released in the blood. Since the bones are the primary source of this calcium, hyperparathyroidism can result in excess bone loss or osteoporosis. If the condition is successfully treated, the bone loss can usually be reversed and bone density can be restored. Most cases (85%) of hyperparathyroidism are the result of a single parathyroid gland malfunctioning and developing into a benign tumor, known as an adenoma. In nearly all other cases (15%), two or more glands enlarge, again in a benign fashion, a condition called hyperplasia. Parathyroid cancer is a rare cause of primary hyperparathyroidism.

9. Hyperparathyroidism - April 15, 1998 - American Academy Of Family
by the authors of this article, is provided on page 1807. hyperparathyroidism is a common cause of hypercalcemia.
http://www.aafp.org/afp/980415ap/allerhei.html

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Hyperparathyroidism
DAVID A. ALLERHEILIGEN, M.D., JOE SCHOEBER, M.D., ROBERT E. HOUSTON, M.D., VIRGINIA K. MOHL, M.D., and KAREN M. WILDMAN, M.D.,
University of Wyoming, Casper, Wyoming
A patient information handout on hyperparathyroidism , written by the authors of this article, is provided on page 1807. Hyperparathyroidism is a common cause of hypercalcemia. The hypercalcemia usually is discovered during a routine serum chemistry profile. Often, there has been no previous suspicion of this disorder. In most patients initially believed to be asymptomatic, previously unrecognized symptoms resolve with surgical correction of the disorder. The symptoms of hyperparathyroidism are vague and often similar to symptoms of depression, irritable bowel syndrome, fibromyalgia or stress reaction. Complications of primary hyperparathyroidism include peptic ulcers, nephrolithiasis, pancreatitis and dehydration. Surgical management is usually indicated. When medical management is used, routine monitoring for clinical deterioration is recommended. Preoperative localization of adenomas with technetium Tc 99m sestamibi scan is possible but may be unnecessary. An experienced surgeon should perform the parathyroidectomy. D uring the early 1970s, the advent of multichannel autoanalyzers and the "profiles" they produced appeared to increase the incidence of primary hyperparathyroidism fivefold, but the severity of the condition declined to an "asymptomatic" presentation.

10. Hyperparathyroidism - Endocrinology Health Guide
Brief discussion of this disorder, its symptoms, diagnosis and treatment.Category Health Conditions and Diseases hyperparathyroidism......hyperparathyroidism is caused by overactive parathyroid glands. Thisguide covers symptoms, diagnosis and treatment. hyperparathyroidism.
http://www.umm.edu/endocrin/hyperpar.htm

Endocrinology Health Guide...
Pituitary Gland Disorders... Pancreas... Adrenal Glands... ... Glossary
Related Resources Within UMM Endocrinology Joslin Diabetes Center School of Medicine Endocrinology Site Endocrinology Health Guide
Hyperparathyroidism
What is hyperparathyroidism?
Hyperparathyroidism is caused by overactive parathyroid glands. Overactive parathyroid glands produce too much parathyroid hormones, which in turn stimulate increased levels of calcium in the blood stream. The excess calcium released by the bones leads to osteoporosis and osteomalacia (both bone-weakening diseases). Other results of hyperparathyroidism are kidney stones, because of high levels of calcium excreted into the urine by the kidneys. Causes of hyperparathyroidism include benign tumors on the parathyroid glands or enlargement of the parathyroid glands. What are symptoms of hyperparathyroidism?
The following are the most common symptoms of hyperparathyroidism. However, each individual may experience symptoms differently. Symptoms may include:
  • aches and pains
  • depression
  • abdominal pain
  • nausea
  • vomiting
  • fatigue
  • excessive urination
  • confusion
  • muscle weakness
The symptoms of hyperparathyroidism may resemble other conditions or medical problems. Consult a physician for diagnosis.

11. Parathyroid
An overview of this disease. A look at the diagnosis and methods of treating it.
http://endocrinesearch.com/Parathyroid.htm

Parathyroid

Thyroid

Adrenal

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Commonly asked questions and treatment information:
What is a parathyroid gland?
The parathyroid glands are small, endocrine glands situated in the neck that regulate calcium metabolism. Typically, most humans have 4 parathyroid glands, 2 on each side of the neck, however, approximately 8% of people will have either 3 or 5 glands. Each parathyroid gland, which is about the size of a small pea, produces a hormone called parathyroid hormone (PTH). PTH acts directly on the kidneys and bone to increase serum calcium levels, and indirectly on the gastrointestinal tract to enhance the intestinal absorption of calcium. The net effect of each of these mechanisms is an elevation in the serum calcium level. Figure 1: Calcium Metabolism What is hyperparathyroidism? Primary hyperparathyroidism is a common disease that occurs when one or more of the parathyroid glands become overactive. This leads to the overproduction of PTH, resulting in an abnormal elevation in serum calcium. In 85% of patients with primary hyperparathyroidism, the hypercalcemia is due to the benign enlargement of a single parathyroid gland, commonly referred to as a parathyroid adenoma. In 10%-15% of patients, primary hyperparathyroidism is caused by the enlargement of all 4 parathyroid glands, a state called parathyroid hyperplasia . In addition, up to 5% of patients can have a double adenoma, or enlargement of 2 parathyroid glands.

12. Hyperparathyroidism Hub
Links to overviews, clinical trials, treatment programs and images on hyperparathyroidism.
http://www.healthubs.com/hyperparathyroidism
Hyperparathyroidism Hub
Hyperparathyroidism is a disorder of the parathyroid glands, caused by increased parathyroid hormone (PTH). It is diagnosed when tests show that blood levels of calcium as well as PTH are too high. Other diseases can cause high blood calcium levels, but only in hyperparathyroidism is the elevated calcium the result of too much PTH. Surgery to remove the enlarged gland is the only treatment for the hyperparathyroidism and cures it in 95 percent of cases.
Acne
Allergy Antibiotics Antioxidants ... Wedding Overviews - General Hyperparathyroidism by NIDDK Hyperparathyroidism from University of Connecticut Health Center Hyperparathyroidism from Catholic Healthcare West Hyperparathyroidism by the University of Maryland Medical System ... Fast Facts on Primary Hyperparathyroidism - from National Institute of Health, Osteoporosis and Related Bone Diseases, National Resource Center. Hyperparathyroidism - by David A. Allerheiligen, M.D., Joe Schoeber, M.D., Robert E. Houston, M.D., Virginia K. Mohl, M.D., and Karen M. Wildman, M.D., University of Wyoming, Casper, Wyoming. The Management of Recurrent or Persistent Hyperparathyroidism Persistent Hyperparathyroidism and Nephrocalcinosis - by J. Anthony Parker

13. BCI-Home
Discovers, develops and commercializes dhormones for treatment of hyperparathyroidism associated with end-stage renal disease, renal osteodystrophy, osteoporosis, psoriasis, prostate and breast cancer. (Nasdaq BCII).
http://www.bonecare.com/
Welcome!
Bone Care International is an innovative pharmaceutical company dedicated to improving patient outcomes by delivering unsurpassed Vitamin D hormone therapies. Bone Care is committed to discovering, developing and commercializing products by fostering a high performing corporate culture which values employees and promotes an entrepreneurial spirit. Please follow the links to the left for more information

14. NPS Pharmaceuticals
Discovers and develops orally active, small molecule drugs which target cell surface receptors and ion channels for treatment of disorders such as hyperparathyroidism, osteoporosis, stroke and head trauma, epilepsy and bipolar disorder. (Nasdaq NPSP).
http://WWW.NPSP.COM/
Welcome to NPS Pharmaceuticals The commitment of the people of NPS Pharmaceuticals is to build an enduring worldwide company, the purpose of which is to develop innovative drugs to maintain human health and relieve suffering. This commitment is founded on principles of honesty, hard work, respect, the constant quest for knowledge, and the realization of marketplace success.
The merger of Enzon and NPS
creates
a powerful new leader in biotechnology.

NPS Pharmaceuticals is currently developing drug candidates ranging from the earliest stages of discovery research to late-stage clinical trials. Several of these drugs target diseases and disorders that represent poorly met or unmet medical needs. These conditions affect some of the most important systems in the human body including: skeletal endocrinological gastrointestinal central nervous system At NPS, we are focused on developing

15. The Paget Foundation - For Paget's Disease Of Bone And Related Disorders
Information and programs for patients and medical professionals on Paget's disease of bone, primary hyperparathyroidism, fibrous dysplasia, osteopetrosis, breast cancer metastatic to bone, and prostate cancer metastatic to bone.
http://www.paget.org
This website includes information for patients and health
professionals on the following bone diseases and conditions:
Paget's disease of bone, primary hyperparathyroidism, fibrous dysplasia, osteopetrosis (not osteoporosis) and the complications of some cancers to the bones. This website does not include information on Paget's breast disease.

Please Select a Link Below
(Select "Patients Needed for Research Studies" under patients section)
A Brief Overview
The Paget Foundation, founded in 1978, is a national voluntary health agency located in New York, NY. It is named for Sir James Paget, the eminent British surgeon who first identified Paget's disease of bone. Dr. Paget also discovered other diseases including Paget's disease of the breast and Paget's disease of the vulva. The Paget Foundation does not provide information on the breast and vulva diseases. The foundation provides information for patients, the general public and health professionals, and supports and advocates for increased research on all bone diseases.
Physician Referral
Physician referral lists are available for Paget's disease, primary hyperparathyroidism, fibrous dysplasia and osteopetrosis.

16. New York Thyroid Center: Clinical Trials For Hyperparathyroidism
he Metabolic Bone Disease Program is seeking people interested in participatingin experimental treatments for hyperparathyroidism and osteoporosis.
http://cpmcnet.columbia.edu/dept/thyroid/parastudies.html
Related Topics: Hyperparathyroidism Parathyroid Surgery Choosing a Surgeon New York Thyroid Center Home he Metabolic Bone Disease Program is seeking people interested in participating in experimental treatments for hyperparathyroidism and osteoporosis. There are currently two projects available to eligible patients. If you are interested in learning more about these conditions and joining these projects, call Study #1: Combination Therapy Using Alendronate (Fosamax) and Parathyroid Hormone (PTH) in the Treatment of Postmenopausal Osteoporosis Study #2: Raloxifene (Evista) in Primary Hyperparathyroidism Combination Therapy Using Alendronate (Fosamax) and Parathyroid Hormone (PTH) in the Treatment of Postmenopausal Osteoporosis Columbia Presbyterian Medical Center is currently looking for women who are interested in taking part in a study to investigate a new treatment for osteoporosis. Osteoporosis (sometimes called "brittle bones") is a condition in which bone mass and bone strength is reduced so that fractures occur much more easily. This study will evaluate the effectiveness of combining PTH and Fosamax in treating osteoporosis. Studies have shown that both PTH, a hormone which has not been approved for use outside of research studies and Fosamax, a drug which has been approved for the treatment and prevention of osteoporosis, lead to an increase in bone mineral density. PTH alone has shown in past studies to lead to an increase in bone mineral density that is greater than currently available therapies.

17. Endocrine Surgery At Johns Hopkins
The Johns Hopkins Medical Institutions Endocrine Surgery Web. Thyroid, hyperparathyroidism, adrenal, and carcinoid tumors. An online discussion area.
http://www.path.jhu.edu/endocrine
THE JOHNS HOPKINS MEDICAL INSTITUTIONS
Endocrine Surgery Web
Endocrine Surgery at Johns Hopkins
The Endocrine Surgery site has merged with the Department of Medicine's sites related to endocrine disorders. The discussion board is still active.
Please see the following sites for more information. For information about thyroid tumors, please see http://www.thyroid-cancer.net/ Help Feedback Pathology Home ... Search Logout Last Modified: 08/12/2002

18. MDchoice.com The Ultimate Medical Information Finder Primary Hyperparathyroidism
MDchoice.com Explanation of this disorder, the importance of calcium and phosphorous, causes, symptoms, diagnosis, treatment and surgery.
http://www.mdchoice.com/Pt/consumer/Hyperparathyroidism.asp
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Hyperparathyroidism Disorder
Primary hyperparathyroidism is a disorder of the parathyroid glands. Most people with this disorder have one or more enlarged, overactive parathyroid glands that secrete too much parathyroid hormone. In secondary hyperparathyroidism, a problem such as kidney failure makes the body resistant to the action of parathyroid hormone. This e-pub focuses on primary hyperparathyroidism.

19. Primary Hyperparathyroidism-Bone Diseases And Disorders
Bone Diseases. Primary hyperparathyroidism. Did you know? These glands areresponsible for calcium regulation. What is primary hyperparathyroidism?
http://www.umm.edu/bone/hyperpar.htm

Bone Diseases
What is Bone? Bone Cancers... Diagnostic Procedures ... Glossary
Related Resources Within UMM Dept. of Orthopaedics Kernan Hospital Skeletal Radiology Bone Diseases
Primary Hyperparathyroidism
Did you know? The parathyroid glands are located in the neck, near the thyroid gland. These glands are responsible for calcium regulation. What is primary hyperparathyroidism?
Primary hyperparathyroidism is a metabolic disorder in which one (or more) of the parathyroid glands produces too much parathyroid hormone, which can result in the loss of bone tissue. Primary hyperparathyroidism affects 28 out of 100,000 people in the US each year, and is more prevalent in women than in men. A function of the parathyroid hormone is to keep blood-calcium levels from going too low by releasing calcium from bones, conserving calcium that would be excreted by the kidneys, and increasing calcium absorption from food. When the hormone overacts, the result is a rise in the blood-calcium level. When one parathyroid gland becomes enlarged, the condition is called adenoma. When more than one becomes enlarged, the condition is called hyperplasia. Both of these conditions are benign (non-cancerous).

20. Advanced Search
bullet, hyperparathyroidism What It Is and How It's Treated. Whatis hyperparathyroidism? When the parathyroid glands make too much
http://www.aafp.org/afp/980415ap/980415f.html

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Please note: This information was as current as we could make it on the date given above. But medical information is always changing, and some information given here may be out of date. For regularly updated information on a variety of health topics, please visit familydoctor.org , the AAFP patient education Web site. Hyperparathyroidism: What It Is and How It's Treated What is hyperparathyroidism? When the parathyroid glands make too much hormone, it's called hyperparathyroidism (HPT for short). The parathyroids are four glands behind the thyroid gland at the front of your neck. The hormone they make is called parathyroid hormone (or PTH). This hormone keeps the right level of calcium in your blood and bones. It helps you absorb calcium from your food and helps you lose less calcium in urine. The amount of calcium going into your bones usually matches the amount of calcium coming out of your bones. This means that the amount of calcium in your bones should stay about the same all the time. If you have HPT, you have too much calcium in your blood. (More calcium is being taken out of your bones than is being put back.) Having too much calcium in your blood also means that other parts of your body don't work right. HPT is usually caused by a noncancerous growth in one of the parathyroid glands. These growths are too small for you to feel.

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