Right lower front rib cage pain gotten worse over a week. more right side than center. it makes it uncomfortable to breathe deep or do sit ups.

Rib cage pain: If you can pinpoint the discomfort to the rib cage and not the abdomen, then gall bladder, lung or liver pathology is not likely. Has there been a recent injury, strain from exercises or work activities? Try avoiding any strain on your rib cage or abdominal muscles for a week or so. If distress persists an examination and possibly an xray are advisable.