The guide "Marfan Syndrome" offers a comprehensive introduction to the rare, hereditary connective tissue disorder. It is aimed at those affected, their relatives, and healthcare professionals, providing valuable information about the symptoms and challenges associated with Marfan syndrome. The authors, experienced scientists and volunteers, have made it their mission to present complex medical content in an understandable language. The guide includes practical tips for everyday life and also highlights related conditions that exhibit similar symptoms. With a clear focus on the needs of the readers, it offers valuable support in dealing with the disease.