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I've been running for nearly 10 years now, training and competing. But recently I have been suffering from a very intense stitch shortly after I start running (about 2 or 3km in). Now I know all about the regular stitch and breathing etc, but this is a very intense stitch just under the bottom of my right rib, its so painful it usually causes me to immediately stop running and curl up in pain. If it is less intense I can usual slow right down and jog through it but it is still very very painful, not bearable at all.
Does anyone have any theories as to why this is happening? I have been training less than usual due to work commitments but that shouldn’t be an issue really. I don't eat for 2 hours before training either. I will finish a training session but not be tired because I couldn’t run at full capacity because of this stitch. Its incredibly frustrating!
Any help would be greatly appreciated.