Male, had an upper endoscopy procedure done doctor found inflammation in my stomach.. what does this mean? also found hiatal hernia?

Inflammation is just another term for irritation. The stomach inner lining can be irritated/reddened by many factors including excess acid production or infection. It would be best for you to explore the docs feelings about what s/he thinks caused the problem.

Inflammation in the stomach lining is also known as gastritis. There can be many causes of gastritis. Commonly, it can be due to a bacteria called H. Pylori. If that bacteria is present, it will need to be treated. Your gastroenterologist likely took Samples to check for that. You should contact your gastroenterologist for follow-up of the inflammation. Good luck.