The answer to 'toilet making noise' is that there are several common causes, including a worn-out flush valve, a loose or damaged flapper, or a problem with the tank fill valve. Symptoms may include a running toilet, a loud hissing or gurgling sound, or water continuously running into the bowl.
In many cases, these issues can be resolved with a simple DIY repair. However, if the problem persists or you're not comfortable making the repair, it's best to call a professional plumber to diagnose and fix the issue. They have the expertise and tools to properly identify and address the root cause of the noise.