<s>[INST] I have a weird sensation in ride side of stomach (abdomen) about half way between belly button and ribs (just off to right side). mostly noticeable when I bend over or stretch. had ultrasound and blood tests and all organs are fine... nothing irregular showed up. all good. could it be a muscle issue? feels like stitch like feeling when I exercise (ride bike), but most noticeable if I riding hunch up. if I stretch out on bike it feels better. thesensation does not feel too deep. I have previously had IBS issues, but that seems a lot better on Gluten free diet and minimal dairy.... have been referred for another ultra sound for possible hernia - but the feeling is more general area roughly about size of palm of hand.... but always in the same region. any ideas? [/INST] Thanks for query. Pain which changes on posture and as you mention not so deep. With normal investigations it might be probably muscular in origin. Hernia would give you a bulge in that area. If pain is severe you need a complete evaluation to rule out all possible causes like Biliary tract diseaseAppendicitisDiverticulitisMesenteric ischemia (risk factors include atrial fibrillation, atherosclerotic disease, and low ejection fraction)Abdominal aortic aneurysmPeptic ulcer diseaseMalignancyGastroenteritis. I am not here to scare you. But just to enumerate that these are possible causes of abdominal pain.regards </s>