I have pain starting just under the diaphragm, what should i do?

Epigastric pain: Most commonly, epigastric pain is the result of overeating, drinking alcohol while eating, or consuming greasy or spicy foods. Epigastric pain can be caused by digestive conditions such as acid reflux or lactose intolerance. Gastroesophageal reflux disease (gerd) is another possible cause of epigastric pain. Inflammatory diseases or cancers affecting the gallbladder, pancreas or stomach are poss.