Hiatal hernia is a condition in which part of the stomach extends through an opening the diaphragm into the chest. The diaphragm is the sheet of muscle that divides the chest from the abdomen.
Hernia - hiatal
The exact cause of hiatal hernias is unknown. The condition may be due to a weakening of the supporting tissue. Your risk for the problem goes up with age, obesity, and smoking. Hiatal hernias are very common. The problem occurs often in people over 50 years old.
This condition may cause reflux (backflow) of gastric acid from the stomach into the esophagus.