When you have ulcers you'll usually experience a burning pain or discomfort between your belly button and breastbone.
The ulcer pain will be most noticeable on an empty stomach or at night or between meals.
After taking an antacid the pain should go away for awhile but then can return later.
Pushing on your stomach can cause your ulcers to hurt more so if you feel pain when pushing on your stomach or any of the above pain even when not pushing on your stomach then you likely have ulcers and should see a doctor.