The answer to 'what causes mouse' is the presence of readily available food, water, and shelter. Mice are opportunistic pests that thrive in environments where they can easily find these basic necessities. They are attracted to homes and other buildings that provide a warm, safe place to nest and a reliable food source, such as crumbs, pet food, or stored grains.
Mice are prolific breeders, with females able to have up to 12 litters per year, each with 5-6 offspring. Their small size and ability to squeeze through tiny openings make it easy for them to gain access to homes and establish breeding populations. Once a mouse infestation takes hold, it can be challenging to eliminate without the help of a professional pest control technician.