Get a stomach ache after a banana? There are several potential reasons for this. Make sure your bananas are ripe. Unripe bananas are starchy, and your body has to work hard to digest that much starch.
Stomach aches after a ripe banana can indicate an allergy. It may also be from a gastrointestinal disorder or infection.
You may want to talk to your doctor if after-banana stomach aches are new.