2. Acid reflux
Acid reflux happens when the contents of the stomach move in a reverse direction towards the esophagus. Acid reflux may also be referred to as GERD or acid regurgitation. The stomach discomfort caused by acid reflux happens when the muscle at the end of the esophagus becomes lax and allows food from the stomach to renter the esophagus instead of moving forward into the intestines.
Acid reflux typically brings about a burning sensation in the chest that can be accompanied by pain in the abdominal region. The discomfort radiates upwards from the stomach to the mid chest area and can go as far as the throat.