Acidity is a digestive fluid formed in the stomach. It is composed of hydrochloric acid, potassium chloride and sodium chloride. Our stomach produces acid to digest the food that we eat. This is a regular and natural process. When we eat; cells within the lining of the stomach pump acid to liquefy our sumptuous dinner, from mash potatoes to a slab of steak.
Problem occurs when these cells produce large amount of acid, more than your stomach needs. When this happens, you will suffer from stomach acidity. You would know if you were suffering from stomach acidity if you feel a burning sensation just above the stomach, or right below your breastbone. This is the most classic sign of acidity.
Excess acid secretion can also cause acidity, when the normal protective lining of the stomach and duodenum (the part of the intestine that joins the stomach), is damaged.