The answer to 'why do I have cockroach' is that cockroaches are a common household pest that can infest homes for a variety of reasons. Cockroaches are attracted to food, moisture, and warm environments, and they can enter homes through cracks, crevices, and other small openings. Signs of a cockroach infestation include seeing the insects themselves, finding their droppings, or noticing a musty odor.
To get rid of cockroaches, it's important to first identify and eliminate the sources that are attracting them, such as food spills, leaks, and clutter. Homeowners can try DIY methods like using bait traps, sprays, or diatomaceous earth, but for more severe infestations, it's best to call in a professional pest control technician who can use more effective treatments and develop a comprehensive plan to eliminate the problem.