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Genetic and Rare Diseases Information Center (GARD)


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Pseudohypoparathyroidism is a genetic disorder in which the body is unable to respond to parathyroid hormone. Parathyroid hormone helps control calcium, phosphorous, and vitamin D levels in the bones and blood. Hypoparathyroidism is a similar condition in which the body does not make enough parathyroid hormone instead of not being able to respond to it (as in pseudohypoparathyroidism).[1]

The symptoms of these two conditions are similar and are caused by low calcium levels and high phosphate levels in the blood. This may cause cataracts (clouding of the lens of the eye), dental problems, numbness, seizures, or tetany (muscle twitches and hand and foot spasms). These symptoms are usually first seen in childhood.[1]

There are two different types of pseudohypoparathyroidism, both of which are caused by spelling mistakes (mutations) in certain genes. Type 1 can be further divided into three sub-types.[1] Click on the links below for more information on the various types of pseudohypoparathyroidism.

Pseudohypoparathyroidism type 1A
Pseudohypoparathyroidism type 1B
Pseudohypoparathyroidism type 1C
Pseudohypoparathyroidism type 2
Last updated: 1/5/2016


  1. Topiwala S. Pseudohypoparathyroidism. MedlinePlus. July 2012; Accessed 10/17/2012.
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Basic Information

  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.

In Depth Information

  • Medscape Reference provides information on this topic. You may need to register to view the medical textbook, but registration is free.
  • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
  • The Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Pseudohypoparathyroidism. Click on the link to view a sample search on this topic.

Selected Full-Text Journal Articles

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