The answer to 'why is my garbage disposal overflowing' is that a clogged or blocked garbage disposal is the most common cause of an overflowing sink. This can happen when the disposal becomes jammed with food waste or other debris, preventing water from draining properly.
Some common symptoms of an overflowing garbage disposal include water backing up in the sink, a foul odor, or the disposal making strange noises when turned on. In many cases, this can be fixed with a simple DIY unclogging process, but in more severe cases, it may require a professional plumber to diagnose and repair the issue.