The answer to 'why is my drain trap frozen' is that a frozen drain trap is typically caused by extremely cold temperatures, often during the winter months. The drain trap, which is the U-shaped pipe under your sink, can freeze if the surrounding area gets too cold, preventing water from flowing through it properly.
Some common symptoms of a frozen drain trap include slow or no drainage, gurgling sounds, and even water backing up in the sink. To fix a frozen drain trap, you'll need to thaw it out, which can often be done with a hair dryer or other gentle heat source. However, if the trap is severely frozen or the issue persists, it's best to call a professional plumber who can properly diagnose and address the problem.