Fleas are an almost inevitable consequence of owning a pet!
Almost all cats are exposed to fleas which can transmit diseases as well as being a source of irritation to both cats and people. There are many extremely safe and highly effective medications are now available to treat fleas and many of them also treat ticks, lice and mites. All animals in the house need to be treated, frequency of treatment will depend on the product you use.
It is important to only use flea products on cats which have been designed for cats. Never use dog flea treatments on or near your cat as some can be highly toxic to cats.