The answer to 'why is my mouse infestation' is that mice have likely entered your home in search of food, water, and shelter. Common causes include crumbs or spills, easy access points like cracks or holes, and nesting materials like insulation or cardboard. Symptoms include droppings, gnaw marks, and noises like scratching or scurrying.
To solve a mouse problem, you'll first need to identify and seal any entry points, remove food sources, and use traps or deterrents. If the infestation is severe or persistent, it's best to call a professional pest control service who can safely and effectively eliminate the mice and prevent future infestations.