I had constant severe pain beneath by lower left rib for nearly eight months. It also occasionally spread to areas on my right ribs and sternum – but only with intermittent pain in those areas. It is 98% gone now and only acts up occasionally after doing certain abdominal exercises. The pain felt visceral and hurt constantly, so I was convinced it was something severe (pancreatic cancer or something).
The stress of thinking I had cancer kept me from sleeping, and the non-steroidal anti-inflammatories gave me a bit of an ulcer, and I started taking medication for that, which changed by bowel conditions, leading to IBS-like symptoms, causing more stress, and really sent me into a downward spiral with more medications, side effects from drugs, tests etc.
Ultimately, after a clean whole-body CT scan, and colonoscopy, I went to a pain specialist and had him inject cortisone into my intercostals tissue around my ribs. This made the pain worse for a week or so, but then it started getting much better. After the injections, the pain started to feel more “muscular” and less “visceral” – and eventually the pain went away altogether. From these results, and the doctor’s negative findings, I’ve concluded that I must have torn some deep abdominal wall tissue (probably while doing pull-ups or bar dips) and that this tissue was deep enough for the injury to manifest itself as visceral, rather than superficial, pain.
In terms of the pain in other areas, this was likely a result of an inflammatory response (i.e. costochondritis) that stemmed from the initial injury. If you have this problem, I suggest that you: 1) don’t freak out 2) do stop taking recently-added NON-ESSENTIAL medications and supplements for a couple of weeks to see if some of your “symptoms” are really side effects 3) go to a pain specialist and have them inject cortisone in the area where it hurts – if that helps, then it’s almost certainly an injury to your abdominal wall 4) I found that sleeping on my side allowed the injury to heal, while laying on my back stretched the injure tissue over my ribcage, making it worse 5) Keep (or start) exercising. Do abdominal exercises but with low intensity, but definitely stop if the pain increases. I found that swimming and aqua exercises in the pool were slightly painful, but very helpful for my recovery. 6) Improve your posture. Definitely don’t sit four hours with your torso twisted to one side. I think this exacerbated my condition. Also, if you have a clicking sound or slipping movement associated with your ribs, look into "slipping rib syndrome" or "lower rib syndrome", a condition that is also sometimes benefited by cortisone injections.