gut fermentation syndrome
auto-brewery syndrome
endogenous ethanol fermentation
drunkenness disease informal

But the medical community was largely unaware of Gut Fermentation Syndrome then, so the patient wasn't always believed.

The authors conclude their paper by imploring their colleagues in the field to take gut fermentation syndrome seriously.

Auto-brewery syndrome, also known as gut fermentation syndrome, is a rare condition which causes the digestive system to produce alcohol through fermentation.

It's called gut fermentation syndrome or auto-brewery syndrome, and it's "a relatively unknown phenomenon in Western medicine" according to a study published in July's International Journal of Clinical Medicine.