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Page: Diseases and Syndromes
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There are several conditions in which insulin disturbance is pathologic:
* Diabetes mellitus – general term referring to all states characterized by hyperglycemia.
o Type 1 – autoimmune-mediated destruction of insulin producing beta cells in the pancreas resulting in absolute insulin deficiency.
o Type 2 – multifactoral syndrome with combined influence of genetic susceptibility and influence of environmental factors, the best known being obesity, age, and physical inactivity, resulting in insulin resistance in cells requiring insulin for glucose absorption. This form of diabetes is strongly inherited.
o Other types of impaired glucose tolerance (see the diabetes article).
* Insulinoma or reactive hypoglycemia.
* Metabolic syndrome – a poorly understood condition first called Syndrome X by Gerald Reaven, Reaven's Syndrome after Reaven, CHAOS in Australia (from the signs which seem to travel together), and sometimes prediabetes. It is currently not clear whether these signs have a single, treatable cause, or are the result of body changes leading to type 2 diabetes. It is characterized by elevated blood pressure, dyslipidemia (disturbances in blood cholesterol forms and other blood lipids), and increased waist circumference (at least in populations in much of the developed world). The basic underlying cause may be the insulin resistance of type 2 diabetes which is a diminished capacity for insulin response in some tissues (eg, muscle, fat) to respond to insulin. Commonly, morbidities such as essential hypertension, obesity, Type 2 diabetes, and cardiovascular disease (CVD) develop.
* Polycystic ovary syndrome – a complex syndrome in women in the reproductive years where there is anovulation and androgen excess commonly displayed as hirsutism. In many cases of PCOS insulin resistance is present.
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