He endured skepticism but won a Nobel Prize for his work upending the conventional wisdom that stress, diet or alcohol caused the painful condition.

Dr. J. Robin Warren, the Australian pathologist who shared a Nobel Prize for discovering that most stomach ulcers were caused by the bacterium Helicobacter pylori — and not, as had been widely believed, stress, alcohol or spicy foods — died on July 23 in Inglewood, Australia. He was 87.

His death, at a care home, was announced by the University of Western Australia in Perth, where he was an emeritus professor for many years. His daughter-in-law Gigi Warren said the cause was complications after a recent fall.

In 1984, Dr. Warren and his collaborator, the gastroenterologist Barry Marshall, published a paper in the British medical journal The Lancet describing their finding that the spiral-shaped bacterium now commonly called H. pylori festered in the stomachs of patients with ulcers and gastritis. Dr. Warren had first noticed the bacterium on a gastric biopsy sample in 1979.

The paper’s conclusion upended centuries of conventional wisdom about the cause of ulcers. (Psychoanalysts had even written of the “peptic ulcer personality.”) Doctors typically prescribed stress reduction, a bland diet and, starting in 1977, drugs like Tagamet and Zantac to tame the burning acids. Severe cases were sometimes treated with surgery.

Dr. Warren, right, with the gastroenterologist Barry Marshall in 1984. When their study of ulcers was published, gastroenterologists expressed concern about whether to trust potentially paradigm-shifting findings made by two unknown researchers in Australia.University of Western Australia

When the study was published, gastroenterologists were skeptical. They expressed concern about whether to trust potentially paradigm-shifting findings made by two unknown researchers in Australia. And the idea that bacteria could even grow in the stomach was considered blasphemy.

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