Acidity is a term used for troubles caused due to the excessive production of acids in the stomach. Symptoms An excessive amount of acids in the stomach can cause respiratory problems,feeling of nausea,heartburn and formation of gas in the stomach.Acidity may also induce ulcers on the inner lining of the stomach. Root causes Acidity may occur due to the intake of a diet rich in spicy foods and consumption of alcohol or due to the insufficient supply of blood flow to stomach. Psychological stress can also aggravate this problem.