The answer to 'why is my pest infestation' is that pest infestations are typically caused by a combination of factors, including the presence of food sources, moisture, and entry points into your home. Common signs of a pest infestation include droppings, damage to property, and the physical presence of pests.
The best way to address a pest problem is to first identify the type of pest, then take steps to eliminate their food sources, seal up entry points, and use appropriate pest control methods. For minor infestations, some DIY solutions like traps, baits, or natural repellents may be effective. However, for larger or more persistent pest problems, it's generally best to call in a professional pest control technician who can properly diagnose the issue and apply the most effective treatments.