The answer to 'why is my mouse infestation' is that mice are one of the most common household pests. Mice are attracted to homes that provide food, shelter, and nesting materials. Signs of a mouse infestation include droppings, gnaw marks, and sightings of the mice themselves. Mice can contaminate food, damage property, and spread diseases like Salmonella and Hantavirus.
To get rid of a mouse infestation, you'll need to identify and eliminate their food sources, seal up entry points, and use traps or baits to remove the mice. Depending on the severity of the problem, you may be able to handle it yourself with DIY methods. But for large infestations or if the problem persists, it's best to call in a professional pest control technician who can properly assess and treat the issue.