Blocked sinks are a common plumbing issue that can be caused by a variety of factors, including:

• Food waste: Small food particles can get stuck in the plughole and start to accumulate, leading to a blockage.
• Grease and fat: These substances can solidify in your pipes, creating a buildup that makes it difficult for water to pass through.
• Hair: Long hair can get tangled in the drain, preventing water from flowing freely.
• Soap and detergent: Soap scum can build up over time, reducing the size of the drain and making it harder for water to pass through.

If you're experiencing any of these issues, it's important to act fast before the problem gets worse.