13 Surprising Causes of Constipation
Painkillers, specifically narcotics, can cause constipation.
"A lot of receptors for the narcotic class of drugs are in the digestive tract, so it tends to bring everything to a halt," says Thomas Park, MD, a gastroenterologist with the University of Rochester Medical Center Park in New York. "In general, it’s a good idea for everyone who’s placed on one of these drugs to also place them on a gentle laxative like a stool softener."
Some studies (but not all) have suggested that there might be a higher risk of constipation for people who are chronic users of pain relievers like aspirin and ibuprofen.