Bed bugs are not contagious; they are insects, not an illness. However, bed bug infestations can spread from place to place easily and by many methods.
Bed bugs are often found in hotel rooms; if you travel regularly, you are at an increased risk of developing a bed bug infestation. Bed bugs can crawl into luggage and be carried home. Once the luggage enters a home, the bed bugs procreate in the new environment, infesting the home and biting residents in the process.
Bed bugs can attach themselves to clothing and be carried from one place to another. If you sleep in a bed infested with bed bugs and then wear the same clothes home, you will likely develop a problem with bed bugs in your home.
Bed bugs can live in mattresses, couches, chairs and other upholstered furniture. Bed bugs can hide in cracks and crevices and may not always be visible when buying something second-hand. When a piece of furniture infested with bed bugs is brought into the home, the insects will spread throughout the whole house.