Lead paint comes up quite often in real estate transactions. For any home that was built prior to 1978 you can pretty much assume there is lead present. It’s not a huge risk if it is managed properly. However, if you are remodeling or doing a fun project with some old building materials, concerns can rise.
The Environmental Protection Agency offers a great brochure that provides quite a bit of helpful information on the topic. You can download their PDF directly from their website.