An additional drain fitting known as a P-trap is found in many bathrooms. This specific plumbing fixture, which is intended to stop sewage gases from backing up into your home through your drain system, is frequently the cause of smelly shower drains. The trap itself is filled with water, which forms a seal to stop the odors from reentering the house.
If the P-trap is empty or has dried out, scents can easily enter the bathroom through the shower drain and spread around your feet as you use the facility. As a result, checking it is simple—all you need to do is shine a flashlight on it to determine if it seems to be dry or wet.