Pest activity is easier to solve when you identify the species, find the source, and choose treatment that fits the problem. Ants, cockroaches, rodents, termites, bed bugs, and stinging insects do not respond to one spray. A good professional exterminator should inspect first, explain what is driving activity, outline treatment and follow-up, and give clear safety directions. This guide covers what professionals handle, what warning signs mean, typical U.S. costs, when DIY should stop, and how to compare companies before hiring.