Do cats get hormonal during adolescence?

My cat is about one year three months old, and over the last couple of weeks he's gotten, for lack of a better word, bitchy. He used to enjoy cuddling with me and sleeping by me, but now if I pick him up he growls or even hisses. I haven't changed his diet or anything. Did I somehow accidentally traumatize him, or is it normal for cats to get hormonal during adolescents?