The answer to 'what causes flea' is that fleas are typically caused by an infestation of the tiny, wingless insects known as fleas. Fleas thrive in warm, humid environments and can be brought into the home by pets, wildlife, or even on human clothing. They feed on the blood of their hosts, which can lead to itching, irritation, and potential health issues for both pets and people.
Fleas reproduce quickly, with a single female flea capable of laying up to 50 eggs per day. These eggs hatch into larvae, which then develop into adult fleas, continuing the cycle. Flea infestations can be difficult to eliminate and may require a combination of treatment methods, including vacuuming, washing bedding, and the use of insecticides or other pest control products.