Ii there, just want to say I have exactly the same symptoms as you. Severe pain under ribs on right hand side after 5/10 mins of running or brisk walking. I have been doing power walking for 4 years now and never experienced this until recently. It is severe when I run and feels like a terrible stitch. Did you ever get to the bottom of it? Please reply to: ***@**** I have had an abdominal scan and it showed nothing. They thought it was gallstones but it isn't. Doc is now suggesting a gastroscopy and colonoscopy. I don't want either of those done if they are not necessary......... please help.........