This is probably ETAP -exercise induced transient abdominal pain or stitch. It occurs when the sport involves jolting(horse riders suffer from it) although swimmers also experience it. Current thinking is that the cause of this pain is irritation or friction to the parietal peritoneum. As this tissue is throughout the abdomen it can cause localised pain in various sites. The sub diaphragmatic portion of the parietal peritoneum is supplied by the phrenic nerve so this could explain shoulder tip pain. Friciton on this tissue can be caused by increased pressure in the abdomen such as distension after a meal or changes in fluid pressure in the abdomen. Management: fasting prior to exercise, wearing a tight belt, breathing through pursed lips with hyperinflated lungs. Pain may be relieved by bending forward and tensing abdominals. This pain gets less as one ages.

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This is probably ETAP -exercise induced transient abdominal pain or stitch. It occurs when the sport involves jolting(horse riders suffer from it) although swimmers also experience it. Current thinking is that the cause of this pain is irritation or friction to the parietal peritoneum. As this tissue is throughout the abdomen it can cause localised pain in various sites. The sub diaphragmatic portion of the parietal peritoneum is supplied by the phrenic nerve so this could explain shoulder tip pain. Friciton on this tissue can be caused by increased pressure in the abdomen such as distension after a meal or changes in fluid pressure in the abdomen. Management: fasting prior to exercise, wearing a tight belt, breathing through pursed lips with hyperinflated lungs. Pain may be relieved by bending forward and tensing abdominals. This pain gets less as one ages.