There could be many reasons for this. Sometimes it's just a case of indigestion or heartburn caused by eating too fast or consuming foods that don't agree with us. Another frequent reason is acid reflux, characterized by a burning feeling in the chest. Stress or anxiety might also be considerations since they can sometimes affect the chest. Eating smaller meals more often and avoiding fatty, spicy foods is advisable. If the matter persists seek medical help to rule out anything serious.