what are the symptoms of stomach hernia?
['Heartburn.', 'Regurgitation of food or liquids into the mouth.', 'Backflow of stomach acid into the esophagus (acid reflux)', 'Difficulty swallowing.', 'Chest or abdominal pain.', 'Shortness of breath.', 'Vomiting of blood or passing of black stools, which may indicate gastrointestinal bleeding.']