Passage: In 2002, the term for schizophrenia in Japan was changed from seishin-bunretsu-byō (精神分裂病, lit. "mind-split disease") to tōgō-shitchō-shō (統合失調症, lit. "integration disorder") to reduce stigma. The new name was inspired by the biopsychosocial model; it increased the percentage of people who were informed of the diagnosis from 37 to 70% over three years. A similar change was made in South Korea in 2012. A professor of psychiatry, Jim van Os, has proposed changing the English term to "psychosis spectrum syndrome".In the United States, the cost of schizophrenia—including direct costs (outpatient, inpatient, drugs, and long-term care) and non-health care costs (law enforcement, reduced workplace productivity, and unemployment)—was estimated to be $62.7 billion in 2002. The book and film A Beautiful Mind chronicles the life of John Forbes Nash, a mathematician who won the Nobel Prize for Economics and was diagnosed with schizophrenia.

Question: What medical condition did John Forbes Nash suffer from?
schizophrenia