Blow drying and ironing is fine every once in a while, but if done on a consistent weekly basis can lead to thin, damaged hair. Too much heat causes changes in the molecular structure of your hair, and loosens the hydrogen bonds that hold strands of hair together.
Tight hairbands, tight ponytails, braids, avoid styles that pull on your hairline. These styles cause stress and tug the delicate hairs leading to thinning and even loss. If you really enjoy putting your hair in a ponytail either for style or practicality, be sure to use elastic ties that do not have metal. This will help you avoid tangling and pulling out small strands of hair when removing your ponytail.