Hi, it could be due to gastritis.
Maintain a healthy weight. Excess pounds put pressure on your abdomen, pushing up your stomach and causing acid to back up into your esophagus.
Avoid tight-fitting clothing. Clothes that fit tightly around your waist put pressure on your abdomen and the lower esophageal sphincter.
Eat smaller meals. Avoid overeating by eating smaller meals.
Don't lie down after a meal. Wait at least three hours after eating before lying down or going to bed.