Bed bugs are blood-feeding insects, brownish red in color. Bed bugs can't fly, so they either crawl or are carried from place to place. Their flattened shape allows them to easily slip into narrow places in mattress seams, bed frames, headboards, bedside furniture, behind pictures and switchplates, behind baseboards, under buttons on mattresses, and in box springs.
Bed bugs feed about once a week, usually on a sleeper's exposed skin. The bite is nearly painless and goes unnoticed by most people. Some people have no reaction, but a few may develop a hard bump with a whitish center, which can itch for days. Although bed bugs feed on human blood, there has been no evidence that they spread any disease.