Why Is My Toilet Bubbling? When your plumbing system works the way it should, it’s easy to forget all about it. But when a problem catches your attention, the plumbing becomes all you can think about until you resolve the issue. Perhaps you’re experiencing a toilet bubbling when your shower drains. In this post, Drain Doctor brings troubleshooting tips for this problem. Learn more about what makes a toilet gurgle and how to fix it.