The answer to 'why is my toilet making gurgling noise' is that it is likely caused by a blocked or clogged drain pipe. When the toilet drain becomes partially blocked, it can cause air bubbles to be pushed back up through the toilet, resulting in a gurgling sound. This is a common plumbing issue that can have several potential causes, such as a buildup of debris, a problem with the vent stack, or an issue with the drain line itself.
Some common symptoms of a gurgling toilet include the water level fluctuating, the toilet bowl draining slowly, or water backing up into the bowl. In many cases, you may be able to resolve the issue with a simple DIY fix, such as using a plunger or a drain snake to clear the blockage. However, if the problem persists or you're unsure of the cause, it's best to call in a professional plumber to diagnose and fix the issue.