It's consistent or paroxysmal? Is it related to physical exercise? Will deep breath worsen it? How old are you? Have you ever been diagnosed with digestive ulcer? A few life-threatening chest pains: ischemic heart disease, pulmonary embolism, pneumothorax, aortic dissection. Other possible diseases: pneumonia, shingles, intercostal neuritis, pleurisy, esophagitis, hiatal hernia, esophageal cancer, lung cancer.. Is there any rash? Maybe it's shingles? You should go to the hospital to find out.