The answer to 'why do I have extermination' is that you likely have a pest infestation in your home. Common causes of pest problems include food sources, moisture issues, and entry points that allow pests to get inside. Symptoms may include seeing the pests themselves, finding droppings or nests, or observing damage to your home or belongings. The best solution depends on the type of pest, but often involves a combination of eliminating the root causes and using targeted treatments to eliminate the infestation.
If the problem is minor, you may be able to handle it yourself with DIY pest control methods like sealing entry points, removing food sources, and using over-the-counter pesticides. However, for more serious or persistent infestations, it's generally best to call in a professional pest control technician. They have the expertise and equipment to properly identify the pests, assess the extent of the problem, and implement the most effective and safe treatment plan.