Which test reveals you have one?

I recently had to go to a Cardiologist and take a Echo and Stress Cardiogram. He said my heart was fine. He felt I had Acid Reflux and/or a Hiatel Hernia. How can they tell you have a hernia? I recall one Doctor years ago saying I had one, but I do not recall how he discovered that or if test had been ran. Is this something you can feel? I know it bulges outward..but which test reveal it?

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