Chest pain is not always cardiac related. It can also come under many other situations .most common in your age group is musculoskeletal pain , where a sternous physical activity can predispose to the pain . Also lack of exercise and obesity can contribute to the same . Another reason could be GERD (gastro esophageal reflux disease ) where there will be heart burn , nauseation and vomiting also can be associated with chest pain. Also a combination of both GERD and Musculoskeletal pain also can present like this. Still ruling cardiac causes of chest pain is a must