DEAR DR. DONOHUE: If I understand it correctly, in hiatal hernia, a part of the stomach protrudes into the esophagus. If the stomach is protruding into the esophagus, how is the doctor able to take the endoscope through it during endoscopy of the stomach? Also, how do food and drink get into the stomach? Is there a nonsurgical treatment for hiatal hernia? -- D.S.

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