Dwarfism is a condition in which a person, animal or plant is much below the ordinary size of the species. When applied to people, it implies not just extreme shortness, but a degree of disproportion. Dwarfism is now rarely used as a medical term and is sometimes considered impolite or pejorative. While the term little person is the most common expression in America, "dwarf" is still considered polite. According to the Little People of America the human definition of dwarfism is "a medical or genetic condition that usually results in an adult height of 4'10" (147 cm) or shorter, among both men and women, although in some cases a person with a dwarfing condition may be slightly taller than that." There are approximately 200 different types of dwarfism ^*

Of the hundreds of causes of dwarfism in humans, most are genetic, and most involve single gene variations that affect the structure or metabolism of bone, cartilage, or connective tissue. This class of disorder is referred to by physicians as skeletal dysplasia. Chondrodystrophy, chondrodysplasia, osteochondrodystrophy are also used (fairly interchangeably) in the medical literature to refer to most of these conditions. In many of these conditions, the bones are the primary affected body part, and the person is otherwise healthy. In many others, the genetic difference affects other body systems, causing unusual features or other major problems. Achondroplasia is one of the most common and perhaps the most easily recognized skeletal dysplasia. It affects approximately 1 in 40,000 children, both males and females, as it is due to a mutation of an autosomal gene.

Insular dwarfism

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Dwarfism is not always a disadvantage. For instance, insular dwarfism is the dwarfism of species due to isolated environment and it helps to reduce the need for food.

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CNN.com - Health

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