What is the condition where the stomach pushes through the diaphragm?

The condition where the stomach pushes through the diaphragm is a hiatal hernia.

It occurs when part of the stomach moves upward through the esophageal hiatus, the opening where the esophagus passes through the diaphragm. The most common type is a sliding hiatal hernia, in which the stomach and the junction between the esophagus and stomach move upward. A paraesophageal hernia is less common and occurs when part of the stomach moves beside the esophagus.

Many hiatal hernias cause no symptoms. When symptoms occur, they often involve heartburn, acid reflux, regurgitation, chest discomfort, difficulty swallowing, or early fullness. The displaced anatomy can weaken the normal barrier that prevents stomach acid from flowing back into the esophagus.

A hiatal hernia is not the same as an incisional, umbilical, or inguinal hernia. Those involve tissue pushing through weakened areas of the abdominal wall or groin, whereas a hiatal hernia passes through an opening in the diaphragm.