Auto-brewery syndrome is when your tummy acts like a little brewery and makes alcohol in your body. Normally, when you drink alcohol, your tummy gets it from your mouth, breaks it down, and then send it to your blood. But in people with auto-brewery syndrome, the tummy gets all mixed up and starts making alcohol from the food you eat. This can be a problem because it can make you feel drunk even when you didn't drink any alcohol. People with this condition often feel tired, dizzy, or even really drunk even if they didn't touch any alcohol. It's like having a tiny bar in your tummy that makes you feel drunk without taking a single sip.