Congenital Hyperinsulinism International (CHI) is a US-based organization with the global mission to improve the lives of people affected by congenital hyperinsulinism (HI), a rare disorder characterized by excessive insulin production, causing severe hypoglycemia (low blood sugar), that can lead to death or brain damage and disabilities if not identified in a timely manner and properly managed. Founded in 2005 by parents of children with HI, CHI focuses on providing support and advocacy to individuals with HI and their families, raising awareness to improve knowledge of HI among people affected by the condition, medical professionals, and the general public, and supporting and contributing to research for a better understanding of the condition for more advanced diagnostics, new treatments, and cures.