There could be many reasons why your tummy hurts. Some common causes include:

1. Indigestion: Eating food your stomach cannot handle can cause indigestion. This can be due to eating too much, eating foods high in fat, or eating too quickly.

2. Gas: Gas in your stomach or intestine can cause discomfort and pain.

3. Constipation: When the stool does not pass easily from the colon, it can cause discomfort and pain.

4. Irritable bowel syndrome (IBS): IBS is a common digestive disorder that can cause abdominal pain, bloating, and changes in bowel habits.

5. Inflammation: Inflammation in your stomach or intestine can cause pain and discomfort.

6. Food allergies or intolerances: Some people are allergic or intolerant to certain foods, which can cause stomach pain.

It is always a good idea to talk to a doctor if you are experiencing chronic or severe stomach pain. They can help diagnose the underlying cause and provide appropriate treatment.