pain and pressure in right ribcage upper side may be. 1.injuries this is the most common reason why you may be feeling pain under your right rib cage. You might have injured your rib cage and you do not even realize it. 2.gall sotne there are a lot of people who are not aware that problems with the gallbladder will be felt through the right ribcage because of where the gallbladder is located. Having gallstones is one of the main problems that can cause pain under the right rib cage. The gallstones may not be evident in the beginning but as they grow bigger, the stones will block the passageway for urine. This can be very painful and it will be harder for people to pass urine. The less urine that comes out, the more painful it will be. 3.irritable bowel syndrome here are some people who are not aware what Irritable Bowel Syndrome is. Basically, what it does is it changes the bowel syndrome of people. This is usually a problem with the gut that can cause pain that can be felt at the right rib cage. While the pain will usually start at the abdomen, the pain will come up until it is already felt under the rib cage. 4.other causes like gas and acidity problems,bloating abdomen and due to gastritis. first you need to get and an ultrasound of whole abdomen and chest x-ray test done to know about cause if,all reports are normal then nothing to worry about problem.pain may be gas and acidity so,you need to take precaution of diet and exercise regularly.