Hitler suffered from meteorism. "What is meteorism?" you ask. To wit:
"Meteorism is also known as tympanites.
[1]] The primary feature of meteorism is an accumulation of gas in the gastrointestinal (GI) tract which causes a sensation of bloating and abdominal distension.
[1] One of the most common causes of flatulence is improper eating. Modification of eating habits and avoidance of certain triggers may help to alleviate symptoms."
IOW, Hitler suffered from constant and uncontrolled flatulence. He was an extreme farter.
https://www.neatorama.com/2014/03/24/Der-Fartenfhrer-The-Story-of-Hitlers-Health/