The answer to 'flea in my house' is that fleas are a common household pest that can cause serious problems if not addressed quickly. Fleas are small, wingless insects that feed on the blood of humans and pets, and they can reproduce quickly, leading to an infestation in your home.
Common causes of fleas in the home include pets that have brought them in from outside, as well as rodents or other wildlife that may have entered the home. Symptoms of a flea infestation include seeing the insects themselves, as well as itchy bites on your skin and your pets.