Question

why when we eat junk food so our stomach stared paning

Answer 1

Because Gastritis causes the lining of the stomach to become inflamed. It can cause stomach pain, sickness, vomiting, and indigestion. Mild gastritis can be treated at home with medication and changes to diet.

Answer 2

Well it usually doesn't start suddenly but junk food is harmful for health due to the presence of chemicals which increase the taste but they react with the digestive enzymes of our body and sometimes do not get digested completely which may cause pain.