laxatives because the colon is basically lazy and will take a crutch when handed readily. The dependency of laxatives is common.
TMC is where a part of the colon is already lazy/lost its elasticity and normal movement...stop the movement of the rest of the colon, and the area that's the weakest can basically have a buildup of more gas and basically blow.
Pain meds with codeine/narcotic, totally liquid diets, not eating etc can also contritute to TMC...
that's how I see it.
q