Hypoglycemia (hypoglycæmia in the UK) is a medical term referring to a pathologic state produced by a lower than normal amount of sugar (glucose) in the blood. The term hypoglycemia literally means "low blood sugar". Hypoglycemia can produce a variety of symptoms and effects but the principal problems arise from an inadequate supply of glucose as fuel to the brain, resulting in impairment of function (neuroglycopenia). Derangements of function can range from vaguely "feeling bad" to coma, and (rarely) permanent brain damage or death. Hypoglycemia can arise from many causes, and can occur at any age. The most common forms of moderate and severe hypoglycemia occur as a complication of treatment of diabetes mellitus with insulin or oral medications.
Endocrinologists (specialists in disorders of blood glucose metabolism) typically consider the following criteria (referred to as Whipple's triad) as proving that an individual's symptoms can be attributed to hypoglycemia:
However, not everyone has accepted these suggested diagnostic criteria, and even the level of glucose low enough to define hypoglycemia has been a source of controversy in several contexts. For many purposes, plasma glucose levels below 70 mg/dl or 3.9 mmol/L are considered hypoglycemic, but these issues are elaborated in more detail below.
More on [ Hypoglycemia ]

Children with PHHI - A discussion forum for parents with children who suffer from the genetic disorder persistant hyperinsulinemic-hypoglycemia of infancy, which used to be known as nesidioblastosis.
Congenital Hyperinsulinism Center - Information for parents of children with congenital hyperinsulinism (nesidioblastosis or persistent hyperinsulinemic hypoglycemia of infancy), a disorder that causes low blood sugar. From the Children’s Hospital of Philadelphia.
Meta Description: [ Resources for parents and professionals on congenital hyperinsulinism, a disorder that causes low blood sugar or hypoglycemia in infants and children. ]
Hypoglycemia Forum - Provides sufferers and their family members with information and support. People with fibromyalgia and chronic fatigue syndrome are also welcome.
Meta Description: [ The Hypoglycemia Forum is dedicated to providing sufferers of hypoglycemia and their family members with information and support. People with fibromyalgia and chronic fatigue syndrome are also welcome. ]
Hypoglycemia Links and Information - Personal page that features newsgroups, mailing lists, organizations, nutrition, and articles.
Hypoglycemia Support Foundation Inc - Non-profit organization promoting a greater awareness for blood sugar disorders.
Meta Description: [ Are you struggling to find out about Hypoglycemia? The Hypoglycemia Support Foundation can HELP. ]
International NKH Family Network - For parents with children with nonketotic hyperglycinemia (NKH), a rare and still uncurable metabolic disorder.
Meta Description: [ This page is an Internet presence of an international network of parents with children with Nonketotic Hyperglycinemia (NKH), a rare and still uncurable metabolic disorder. ]
Pediatric Oncall - Hypoglycemia - Physician article on newborns with low blood sugar. Details on high risk infants, diagnosis, complications, and treatment.
Meta Description: [ Hypoglycemia in newborns Pediatric Oncall ]
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Suggested Meal Plan For A Hypoglycemia Diet - Personal page that describes two different meal plans provided to a patient with hypoglycemia.
Sweet Nothings - A newsletter exclusively for sufferers of hypoglycemia and includes a personal story.
Symptoms Of Hypoglycemia And Hypoadrenocorticism - Discusses diet, progression, and typical complaints. Bulletin by Hypoglycemia Association, Inc.
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