Hello and thanks for posting

We don’t know what causes CLL but there are some risk factors that can increase the risk of developing it. Having one or more of these risk factors doesn't mean that a person will definitely develop CLL.

Most people with CLL have no family history of it. But studies show that there is a slight increased risk of developing CLL if you have a close relative who has it. A close relative is a parent, sibling, or child.

Most people who have a relative with CLL will never develop it themselves.

I hope this is of use.