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Health and death

Though an admitted hypochondriac, Gould had many pains and ailments, but his autopsy revealed few underlying problems in areas that often troubled him. He worried about everything from high blood pressure (which in his later years he recorded in diary form) to the safety of his hands. (Gould rarely shook people's hands, and habitually wore gloves.) The spine injury he experienced as a child led physicians to prescribe, usually independently, an assortment of analgesics, anxiolytics, and other drugs. Bazzana has speculated that Gould's increasing use of a variety of prescription medications over his career may have had a deleterious effect on his health. It had reached the stage, Bazzana writes, that "he was taking pills to counteract the side effects of other pills, creating a cycle of dependency". In 1956, Gould told photojournalist Jock Carroll about "my hysteria about eating. It's getting worse all the time." In his biography, psychiatrist Peter F. Ostwald noted Gould's increasing neurosis about food in the mid-1950s, something Gould had spoken to him about. Ostwald later discussed the possibility that Gould had developed a "psychogenic eating disorder" around this time. In 1956, Gould was also taking Thorazine, an anti-psychotic medication, and reserpine, another anti-psychotic, which can also be used to lower blood pressure. Cornelia Foss has said that Gould took many antidepressants, which she blamed for his deteriorating mental state.

Whether Gould's behaviour fell within the autism spectrum has been debated. The diagnosis was first suggested by psychiatrist Peter Ostwald, a friend of Gould's, in the 1997 book Glenn Gould: The Ecstasy and Tragedy of Genius. There has also been speculation that he may have had bipolar disorder, because he sometimes went several days without sleep, had extreme increases in energy, drove recklessly, and in later life endured severe depressive episodes.

On 27 September 1982, two days after his 50th birthday, after experiencing a severe headache, Gould had a stroke that paralyzed the left side of his body. He was admitted to Toronto General Hospital and his condition rapidly deteriorated. By 4 October, there was evidence of brain damage, and Gould's father decided that his son should be taken off life support. Gould's public funeral was held in St. Paul's Anglican Church on 15 October with singing by Lois Marshall and Maureen Forrester. The service was attended by over 3,000 people and was broadcast on the Canadian Broadcasting Corporation. He is buried next to his parents in Toronto's Mount Pleasant Cemetery (section 38, lot 1050). The first few bars of the Goldberg Variations are carved on his grave marker. An animal lover, Gould left half his estate to the Toronto Humane Society; the other half went to the Salvation Army.

In 2000, a movement disorder neurologist suggested in a paper that Gould had dystonia, "a problem little understood in his time."