There is an acid present in our stomach called "Hydrochloric acid", which works to digest our food properly. When we eat food, the cells present in the inner layer of the stomach produce this acid so that the food can be digested. When this acid starts forming more than required, we start having stomach irritation or acidity. This can also cause many other problems, such as heartburn and indigestion etc. There can be many reasons for acidity or excessive acid formation in the stomach, such as not chewing food completely, eating too quickly, eating or drinking acid-forming substances, etc.
Acidity is usually not a serious problem and it gets cured by doing some home remedies. However, if it is not treated for a long time, it can cause other problems, such as cancer, stomach ulcers and vomiting etc.This article explains what happens when you have acidity, what to do if you have a burning sensation in your stomach and when to go to the doctor for this.
(Read more - How to control acidity: Home remedies and tips)