Both males and females feed on blood and will often take several blood meals before becoming engorged. They feed for 2 to 10 minutes at least once a day. Flea bites leave small, reddish marks on the skin and cause a slight inflammation. Some people are more sensitive to flea bites than others.
Adult fleas can live for several months without feeding. So even if you leave the house for a time, the fleas will still be there when you return! Even if you get rid of your pets, the infestation can persist because fleas feed on humans as well. For this reason, it is important to treat the infestation as described above.