You've gotten some good advice for occasional irregularity. To the extent it remains a chronic condition, however, you might talk to your doctor about whether there may be some underlying cause.
I've had some ongoing problems with it over the last couple of years myself. When it's really bad, I turn to Cracklin' Oat Bran cereal. It's such a sure-fire bet that my DH and I jokingly refer to it as "poop cereal." Infantile and gross, I know, but it makes us laugh.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher