welcome to HealthcareMagic
Acidity is mainly causes due to daily stress
in life ;wrong timing of food ;spicy food;lack of exercise;mental stress;improper sleep etc.Regular acidity can cause injury
or swelling inside the stomach along the lining which is called gastritis
which causes you pain in upper stomach.So if you want to get relief you can start on tablet-Ranitidine
-300mg twice a day or even Omeprazole-20 mg twice a day half hour before food and take it for at least 15 days and you should be fine.