Mine did. My hair was straight until I hit puberty and then it went crazy. It started off wavy and then got curlier. I have waves and ringlets, especially underneath. I hated my new waves and curls at first which was ironic since I grew up wanting curls and waves. But I discovered this site and learned how to work with my waves and curls and now I love my hair! No more straightening for me! My mom's hair actually did the same thing, so for me, there were genetics involved too.