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
