Can massaging-applying pressure to the right of the umbilicus create abdominal wall pain that mimics appendicitis? chronic constipation sufferer who gets this around once every couple years. previous cts/colonoscopies/blood work have been negative?

Overly vigorous pressure could cause right lower quadrant pain & tenderness. Aggravation by muscular.movements of the abdominal muscles should separate muscular cause of discomfort from appendicitis but if you're unable to do so, don't hesitate to get examined by a physician if discomfort persists especially if there's associated tenderness.