Upper left burning in Abdominal area

Recently, over the past three weeks, I have been getting a constant throbbing and burning sensation in my upper left Abdominal area just below my rib cage. It is not sensitive to the touch nor have I had any irregular bowels. I have not gone to the doctor yet hoping it would just pass.
What could this be? IS it something that I should take serious or could it just be acid/indigestion which has burned a lining in my stomach.
Back, in March I had back surgery and was perscribed a pain medication. Once I had taken it on an empty stomach and the pain felt/feels simular to that experience.
Could that be the cause of this Abdominal pain?

[Ratnakar Kini, MD]

Hi,
Pain-killers can cause ulcer disease.
If your symptom is persisting an upper GI endoscopy has to be done. If ulcer is diagnosed, PPI might be needed for treatment.
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The information provided is for patients’ education only and is not a medical advice. Always consult your personal physician for complete evaluation of your health problem.

- Ratnakar Kini M.D.