Hello, this may be because of acidity/ indigestion/ gas your friend can take:
1. Tablet meftal spas one tablet stat after food
2. Tablet pantocid 40 mg before food once a day for 2-3 days. And follow care advises given below. Avoid food from outside, junk, fried, spicy fatty food take home made light food like moong dal, dalia, chapatti also tell me associated symptoms like vomiting sensation, loose motion/ burning sensation in chest or any other symptoms are present or not? so that we can reach diagnosis. Kindly see a physician for further management.