A bed bug infestation can originate from various sources. You might have brought them into your home with a new piece of furniture, whether secondhand or new. An infested neighboring apartment can also be a source. Sometimes, a visit from someone who has bed bugs can introduce them into your home. Finally, someone in your residence may have brought bed bugs back from a public place, such as a day camp, a hospital, or public transportation, etc. However, it is impossible to be 100% certain of the origin of the infestation.