That is because bed bugs principally feed on hosts' blood. Blood is the reason they live. Otherwise, they would surely not survive. How they feed? Do you really have to know it? Okay, for your information, bed bugs have tiny beaks, similar and smaller to that owned by mosquitoes. They use these beaks to pierce through the skin of their host. After that, when they have pierced some skin, they start sipping and sucking some blood. Because bed bugs are so tiny, they can hardly suck about a fourth of a milliliter from you. That means the blood you will lose when bitten by a bed bus will be so negligible, you would not care at all. Another good thing, bed bugs are proven not to carry or transmit any disease unlike their relatives, like the mosquito.
Bed bugs' bites may leave small red marks that may swell after a few hours. The bitten area would also tend to itch a lot, leaving a feeling of discomfort to the victim. Exterminating bed bugs. There are a handful of ways or measures to kill bed bugs. The stupid way is to capture them one by one, and try to squash them out. That would surely kill them, but it will be gross, tedious, and will surely try your patience. To be sure, applying insecticides or pesticides to infested areas can be a good and effective way. However, doing so would pose a lot of threats, to your health, and to the health of everyone in the house.