@tanner182 - Using plain old soap on your hair can also cause thinning. A lot of hand soaps have all kinds of creepy chemicals in them. Never use hand soap on your hair, even if you're out camping and forgot your shampoo!
Moisturizing your hair might also help with thinning. Try using coconut oil or avocado for half an hour before you wash your hair. The fatty oils in them can really help skin heal and grow healthy hair. Just comb it into your hair with your fingers and let it sit. Rinse it out before you shampoo and condition.