I think they were reffering to "stitch in the side," its intresting that you bring this up because right now their really is not an agreed upon explimation about this, more intresting is that it we haven't been able to replicate it in a controlled setting either. After talking to people who have had episodes of this we think it has to do with adjustments to new metabolic demands and occurs more frequently in untrained individuals. I would speculate it occurs from insufficient blood floor (ischmia) to either the diagphragm or the intercostal muscles.
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