The answer to 'why is my sink making gurgling noise' is that a gurgling sink is often a sign of a blockage or obstruction in the drain or plumbing system. This can be caused by a buildup of debris, hair, food particles, or other materials that are preventing proper water flow.
Some common symptoms of a gurgling sink include water draining slowly, foul odors coming from the drain, and the sink making gurgling or bubbling noises, especially when other fixtures are used. The gurgling sound is typically caused by air being forced back up through the drain as water is trying to flow down.