Abstract
The evidence that genetic and immunogenetic influence operate in the causation of pre-eclampsia/eclampsia (gestosis) is reviewed. The problems of definitive diagnosis are discussed along with the possibility of a multifactorial etiology. The difficulties of differentiating trigger and effector mechanisms are also considered. There may exist a predisposition, probably genetic, operating in some cases, an immunogenetic mechanism in others, and chromosomal factors in a small group.