I began to experience chest pain two days ago. The pain extends from my shoulder to armpit and it hurts more at night .
Chest pain can be caused by - a heart attack , an aneurysm , pericarditis, pleurisy , pneumonia , acid reflux, gas , esophagitis, pulmonary embolism , a disease of the gallbladder, costochondritis, a fractured rib , cancers etc. .