The probability of any specific condition causing the pain is influenced by the location of the pain, factors that make the pain better or worse, patient s age and concurrent symptoms. Therefore, it is difficult to provide a detailed list of diagnoses of conditions that could cause your pain. It is possible that your new pain is a manifestation of your IBS but you are correct in considering other possible causes. Typically gallstone pain is a steady discomfort which gradually increases over 30 to 60 minutes, remains constant for another hour and then gradual subsides. Pain can radiate to other parts of the abdomen, to the back, and to the scapula or tip of the right shoulder.
Many older textbooks state that eating fatty foods precipitates the pain associated with gallstones.
In the last few years, however, we have recognized that the association between fatty foods and gallstone pain is not as great as had been proposed. It is unusual, however, to have constant pain from a gall bladder problem and therefore this diagnosis would become less likely. Inflammation of the stomach, pancreas, colon or small intestine can also produce pain in the right upper quadrant. Ulcers and pancreatic disease must be excluded. Best of luck.