What could be wrong if you are only 12 but your hair is falling out?

It's normal for people to lose hairs everyday, during combing, washing their hair and just moving about. However, most of those hairs are also normally replaced at about the rate they're lost for most of a person's life. If you're only 12 yet are experiencing massive, unexplainable hairloss (it's creating bald patches), you probably should see a doctor. Make sure you're eating correctly in the meantime.