Wolfram syndrome is a rare form of diabetes characterized by high blood sugar levels that result from insufficient levels of the hormone insulin. The chronically high blood sugar levels cause degeneration of the optic nerve, leading to progressive vision loss (optic atrophy). Wolfram syndrome patients often also have abnormal pituitary glands that release abnormally low levels of the hormone vasopressin (also known as antidiuretic hormone or ADH), which causes hearing loss caused by changes in the inner ear (sensorineural deafness), urinary tract problems, reduced amounts of the sex hormone testosterone in males (hypogonadism), or neurological or psychiatric disorders.