“What disorder can be found during stomach surgery?”

Don’t really understand the question. Maybe you can read some medical books or search online if you’re trying to learn about a specific condition.

I am not a surgeon and I don't do surgery. I do endoscopic procedures which include EGD or upper endoscopy to look in the stomach. Many different disorders can be found on endoscopy, the most common being gastritis, esophagitis, ulcers, polyps, tumors, strictures, many inflammatory disorders.