Hiatal hernia or hiatus hernia are synonyms for a common medical condition where a portion of the stomach moves upward into the chest through the diaphragm opening. Other synonyms include diaphragmatic hernia, esophageal hernia, and hiatus herniation. Symptoms of this condition may include heartburn, difficulty swallowing, chest pain, regurgitation, and sour taste in the mouth. There are various types of hiatus hernia, such as sliding hiatus hernia, paraesophageal hernia, and mixed hiatus hernia. Treatment for hiatus hernia may include medication to reduce acid reflux or surgery to repair the hernia. A proper diagnosis and treatment can help manage the symptoms and complications of hiatus hernia.