The answer to 'why is my flea invasion' is that fleas are a common household pest that can quickly multiply and infest your home. Fleas are typically brought into the home by pets, but they can also come in on clothing, furniture, or other items. Symptoms of a flea infestation include seeing live fleas, finding flea dirt (flea feces) on your pets or furniture, and experiencing itchy bites on your skin.
The best solution for a flea infestation is to treat both your home and your pets. This typically involves thoroughly vacuuming and cleaning all carpets, furniture, and pet bedding, then using an effective flea control product on your pets. However, severe infestations may require the help of a professional pest control technician to fully eliminate the problem.