The answer to 'why is my P-trap burst pipe' is that a burst or cracked P-trap is a common plumbing issue often caused by freezing temperatures, corrosion, or physical damage. The P-trap is the curved pipe under a sink or floor drain that creates a water seal to prevent sewer gases from entering the home.
When the P-trap bursts, it can lead to leaks, water damage, and unpleasant odors. Symptoms include water pooling around the sink or drain, gurgling sounds, and a foul sewer-like smell. The solution is to replace the damaged P-trap, which may require a professional plumber depending on the extent of the issue and accessibility.