Can a endoscopy determine if some has a hiatal hernia??

Usually yes.: But sometimes you need esophagram. Consult gi specialist in any case.

Yes it can: An upper endoscopy, or EGD, is one of two ways to find a hiatal hernia. The other way is a xray with swallowed contrast fluid, a barium swallow or upper GI study. The xray is easier to do but the endoscopy gives a very detailed look at the stomach and is less likely to miss a hiatal hernia--when performed by an experienced physician. The procedure usually takes about 10 minutes to perform.