Certainly, your symptoms sound like a hernia. (There are multiple different types of hernias, and some may be more apparent on physical examination than others.)
Abdominal hernias can result from frequent and chronic straining, although it is impossible to say if this has occurred in your case.
It would be best if you could have a surgeon assess you at a time when you feel that this bulge is present. Also, if it has not already been done, a CT scan of the abdomen and pelvis may be helpful.
Sincerely/ Robert A. Wascher, MD, FACS
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