(sorry if "thread necromancy" is frowned upon here, saw this and felt my reponce was needed) in 2001, i was diagnosed with a "detached stomach muscle". what had caused it? not even anything so drastic as a sneeze. i was just stretching and leaning around to the right to see a computer screen which some friends and me were all gathered around. i felt that pang, as you describe, and it didnt seem serious until quite some time later. two weeks after that i was in at the drs to see what was going on. after being an outpatient overnight, i was given my diagnoses, with little explanation beyond that. painkillers and rest were all i was given. but it was months of agony, sore to breath in, sore to breath out, sore to hold my breath, sore to try to relax my muscles. cycling was definately out. after a long time, it did get better though. i remember for years i was fragile though. even the minutest bumps in a car ride were terrifyingly painful. there have been a number of times it has started to resurface, and when it does, i take it very seriously. like now. this is perhaps the third time when it's resurfaced to this extent. not as drastic as the first time, because i know what it is now, and dont move around trying to ignore it, nor try to convince myself i'm a hypochondriac. as i put it to a friend earlier: "if i was offered only two choices, a broken heart with toothache, ear-ache, and migraine, or that detached stomach muscle thing, i'd chose the former. it was that bad." if you've come across this thread as the top result in your search about your condition, as i did; though the Drs might not have much they can do for you, do take the condition seriously, or you can make it worse, and subject yourself to having to endure months of agony. take things very easy, move very gently, and try to stay well within the now much smaller comfort zone and limited range of movement, particularl when it comes to torso twisting. take care. 🙂