Hi..... vitamin B-12 deficiency or problems with your pituitary or thyroid gland can cause hair loss that’s reversible if the problem is corrected, .... To prevent hair damage that may cause hair loss, follow these tips: Go natural: Leave your hair its natural color and texture. If that is not an option for you, give hair time to recover between blowouts and chemical treatments. Choose products wisely: Use a basic shampoo designed for your hair type..... Consult Dermatologist....