There are several challenges in addressing bed bugs infestations. In recent decades, a series of changes including increasing population density, increased shipping and travel, and increasing insecticide resistance have all contributed to a resurgence of these pests. Hiring a pest control company to eradicate the infestation can be expensive, it is not uncommon for people to attempt on their own first. Unfortunately, their exoskeletons do adapt to the things they have been exposed to, so failed attempts build their resistance to chemicals. Pest control professionals are constantly shifting between products to keep up with these adaptations, making bed bugs the most difficult to eradicate in the entire pest control industry.