While fleas are a pest that can live in human hair, this is a rare occurrence. While there are more than 2000 species of fleas around the world, human hair is not one of their preferred habitats. Human hair is a suitable place for only one species of flea, however.
Human hair can be a good place for fleas to lay their eggs, but they do not live in it. Fleas usually feed on the blood of their primary hosts, but can also feed off the blood of humans when the primary host is not present. Fleas will usually leave the area immediately after feeding, but sometimes they can’t find a way to leave the hair.
Fleas are very small and cannot jump very high. The shortest distance a flea can jump is around 8 inches. The highest vertical jump that fleas have recorded is 7.9 inches. This means that they can’t jump into a human’s hair from the ground.
Fleas can live in human hair if they have access to a pet’s hair. However, this is unlikely to happen. The reason for this is that fleas evolved to live on animals with thick, dense fur, which makes humans an unlikely host.