Most small hiatal hernias cause no signs or symptoms. But larger hiatal hernias can cause:  Heartburn Regurgitation of food or liquids into the mouth  Backflow of stomach acid into the esophagus (acid reflux) Difficulty swallowing Chest or abdominal pain Feeling full soon after you eat Shortness of breath Vomiting of blood or passing of black stools, which may indicate gastrointestinal bleeding 
small hiatal hernias cause signs symptoms  larger hiatal hernias can cause:  heartburn regurgitation food liquids mouth  backflow stomach acid esophagus (acid reflux) difficulty swallowing chest abdominal pain feeling full soon eat shortness breath vomiting blood passing black stools  may gastrointestinal bleeding 
hiatal hernia