A blocked sink can be caused by a variety of factors, such as:

• Buildup of food debris, oil, and grease
• Foreign objects, such as hair, soap residue, and small items that may have fallen down the drain
• Broken or damaged pipes
• Tree roots growing into the pipes
• Incorrect installation of the sink or the pipes

Whatever the cause, you need a professional to diagnose and resolve the issue. Attempting to unclog a sink on your own can result in further damage to your pipes and the need for more costly repairs down the line.