Prepubesent

Hello, my son who is 12 has suddenly began acting very, very irritiable.  He used to be so fun loving and easy going, now he is almost no fun to be around.  He does have a few adolescent physical signs, and I am wondering if adolescence could be the problem.  

Do you have any advice for dealing with his hormones and irritablity.  I know it is hard for him and just want to try to make this next growth period of life easier.

Thanks,