Normosmic idiopathic hypogonadotropic hypogonadism (IHH) and Kallmann syndrome are rare congenital forms of secondary hypogonadism characterized by delayed or absent sexual development.

Secondary hypogonadism is when hormone production is caused by problems in brain signaling. In these cases, also known as hypogonadotropic hypogonadism, the activity of the pituitary gland (which ...