Monarch Disease Ontology identifier MONDO_0018555 (hypogonadotropic hypogonadism) is abnormal ovarian or testicular function due to insufficient hormonal stimulation from the hypothalamic-pituitary axis. Also known as: Normosmic idiopathic hypogonadotropic hypogonadism, central hypogonadism, gonadotropic deficiency, hypogonadism, hypogonadotropic, hypogonadotropic hypogonadism with or without anosmia, low gonadotropins (secondary hypogonadism), nIHH, normosmic congenital hypogonadotropic hypogonadism.