Ian, two things were happening when you were getting that nasty chest and shoulder stitch.
The tissue that may be responsible for the pain at least in the shoulder is the parietal peritoneum, which envelops the abdominal cavity, separating the abdominal organs from the stomach muscles. This piece of tissue is sensitive to movement when irritated, which would explain why rest quickly relieves the pain. Additionally, part of the parietal peritoneum extends up and under the diaphragm, giving rise to the referred shoulder pain when irritated.
What could cause this tissue to become irritated? One obvious answer is that if you fill your stomach with food and drink it's going to get bigger, causing it to push against - and so irritate - the parietal peritoneum, so watching food before and water during exercise may help. If its not from over consumption it may well be as a result of a diaphragm spasm irritating this tissue and creating a pain cascade..
As for the stitch itself, it's due to a spasm of the diaphragm. The reason it happens on the right-hand side is the heavier weight of the organs attached on that side. What can happen when your running is that you get into a rhythmn of breathing out as the right foot hits the ground, or in boxing exhaling with that big right hand, which increases the load on the diaphragm and causes the spasm. To avaiod this problem try to change to breathing out as the left foot hits the ground, or breathing more evenly between your left and right handed strikes.
thats all from the handyman tonight.
you kiddies all have a great day
Lucas
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