As a living, breathing, eating human being, there's a good chance that you've had trouble pooping at one point or another. Maybe you've suffered for days from constipation—feeling backed up and uncomfortable—and the longer it lasts, the worse it gets (and the worse you feel). While it usually (thankfully) resolves on its own—or with a little help from extra fibrous foods or a stool softener—it's important to know that there is a cutoff for how long you can go without pooping before you should see a doctor to see what's up down there. Here's what you need to know, according to gastroenterologists.