No bed bugs do not spread disease. Go to the CDC s website, www.cdc.gov . Bed bugs are definitely a nuisance, and no body wants them but anyone can get them. They are "hitch-hikers" and can be picked up anywhere a person sits at rest, not just a bed. They are attached by the carbon dioxide people exhale, they inject a numbing agent into your skin when they feed so you don t feel their bite. The numbing agent is what causes rashes on some people, it is an allergic reaction to the numbing substance.