For some reason it tends to grow back curly. I have my own theory on that since my hair is straight, or used to be and when it grew back it was very, very curly! Since your follicles release the hair they get really, really small. Then, when you are off chemo, it is like when you rub a ribbon against scissors to get curl...it has to squeeze through a little follicle and therefore, tada, you get curls! hehe...I don't know if it is true but it feels right to me. My hair as since gotten back to being pretty straight but I do have a little body in it now than I had before and it is thicker! And, I am finally growing it out. By my birthday it should be in a "bob" style!