The Vatican said on Monday that Pope Francis died of a stroke, followed by a coma and the collapse of his cardiovascular system. A stroke occurs when the blood supply to the brain is disrupted, either because of a clot or bleeding in the brain. The declaration of death said Francis had Type 2 diabetes and high blood pressure, both of which can increase the risk of stroke.
He also had a chronic lung condition called bronchiectasis, which can weaken and enlarge the airways and leave them more susceptible to infection. When an infection occurs in a patient with bronchiectasis, "what can sometimes happen is things go from bad to worse," said Dr..
.. Nina Agrawal.
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Pope Francis Had Health Issues That Increase Stroke Risk

The declaration of death said the pope had Type 2 diabetes and high blood pressure, along with bronchiectasis, a chronic lung condition. - www.nytimes.com