A blocked sink can be caused by a wide range of issues, from something as simple as a build-up of food debris to more complicated issues like damaged pipes or clogged drains. Some of the most common causes of blocked sinks include:

• Food debris: Bits of food, coffee grounds, and other debris can build up in your sink and cause blockages over time.
• Grease and fat: Oil and grease can solidify in your pipes and create stubborn blockages that are difficult to remove.
• Hair: If you shave or wash your hair in the sink, hair can accumulate in the pipes and lead to blockages.
• Soap scum: Soap can leave a residue in your sink and pipes, which can build up over time and cause blockages.

These are just a few of the many reasons why your sink may be blocked. Whatever the cause of your blockage, it's important to take action quickly to prevent further damage and ensure that your sink is fully functional.