The most common symptom of a stomach ulcer is a burning or gnawing pain that develops in your abdomen (tummy).
But some stomach ulcers aren't painful and are only noticed when a complication of a stomach ulcer develops, such as bleeding from the ulcer.
The pain caused by a stomach ulcer can travel out from the middle of your tummy up to your neck, down to your belly button, or through to your back.
It can last from a few minutes to a few hours, and often starts within a few hours of eating. You may also wake up in pain during the night.
Taking indigestion medication (antacids) may relieve the pain temporarily, but it'll keep coming back if the ulcer isn't treated.
Less common symptoms of a stomach ulcer can include:
Some people also find they burp or become bloated after eating fatty foods.
Visit your GP if you experience persistent symptoms of a stomach ulcer.
Contact your GP or NHS 111 immediately, or go to your nearest accident and emergency (A&E) department, if you develop signs of a serious complication.
If you're not sure that you have a stomach ulcer, see other causes of stomach pain.