The answer to 'why is my pipe making gurgling noise' is that a gurgling sound in your pipes is usually caused by a blockage or obstruction that is allowing air to bubble up through the water. This can be a sign of a clogged drain, a problem with the vent system, or other plumbing issues. The gurgling noise indicates that there is an obstruction preventing the smooth flow of water through the pipes.
Some common causes of a gurgling pipe include a clogged drain, a blocked vent pipe, a problem with the P-trap, or a issue with the septic system. The gurgling noise is often a symptom of a larger plumbing problem that needs to be addressed. In many cases, you may be able to resolve the issue with some basic DIY troubleshooting and plunging, but more serious problems may require the assistance of a professional plumber.