Picture of Traction Alopecia
Tight braids and ponytails can pull hard enough on hairs to make them fall out. If this happens, it's best to choose hairstyles that put less pressure on hair roots. The sooner this is done the better in order to avoid permanent damage.
Image Source: Image reprinted with permission from eMedicine.com, 2010.
Text: MedicineNet - Hair Loss in Men and Women