This document summarizes several forms of congenital adrenal hyperplasia including: - 21-hydroxylase deficiency, which can cause glucocorticoid and mineralocorticoid deficiency, ambiguous genitalia, and is treated with glucocorticoid and mineralocorticoid replacement along with surgical correction if needed. - 11β-hydroxylase deficiency which causes similar symptoms and is treated similarly. - Other rare forms are also summarized, along with their signs, laboratory findings and treatment approaches.