A blocked sink can be caused by a variety of factors, including food particles, grease, hair, soap residue, and foreign objects such as toys or utensils that get stuck in the plughole and prevent water from flowing freely through the drain. Sometimes, even the accumulation of large quantities of toothpaste or shaving cream can lead to the formation of a clog.

The symptoms of a blocked sink are usually easy to detect. You may notice that the water in your sink takes longer than usual to drain, or that it doesn't drain at all. You may also hear a gurgling sound coming from the drain or notice unpleasant smells emanating from the sink.

If you allow a blocked sink to persist for too long, it can lead to more serious issues, such as water damage to your property, the growth of harmful bacteria and mold, and even pest infestations.