Jalapeno peppers are good for your health in moderation and even possibly prevent cancer and detox your body as well.
But it is possible to eat too many Jalapeno peppers which can then lead to ulcers and the jalapeno peppers due to being spicy can also eat at your stomach lining and cause stomach bleeding.
So avoid eating too many Jalapeno Peppers to avoid getting stomach issues and if your stomach is hurting when eating a lot of Jalapeno Peppers then it's likely you're eating too many Jalapeno peppers.
If you think you might have stomach bleeding or ulcers from eating the Jalapeno Peppers then you should see a doctor so that the ulcers or stomach bleeding doesn't get worse.