It would be nice to say balding is just a guy thing and we don't have to worry about it, but that is far from the truth. Women too, must be mindful when managing their hair to avoid balding. Hair loss is a progression and is not something that happens overnight.
Any hair style that puts too much tension on the hair can cause Traction Alopecia, a hair loss condition where the hair on the scalp begins to shed. The most common hairstyles that contribute to this hair loss condition are braids/plaits, locs, cornrows, buns, ponytails, and hair extensions. These hairstyle are not the problem, but rather how tight they are.
When you wear hair extensions, always get them fitted by a professional. The weight of hair extensions pull on the hair shaft and follicle so it is wise to be conscious of when your hair has had enough (see All the signs - For a New Sew-In.) Also, be careful with tight headgear such as wigs, hats and headbands that can add more tension.
So! How do you know how tight is too tight? Try the eyebrow test by simply raising your eyebrows. If you feel uncomfortable--like your hair is being pulled from the scalp and you just got a facelift, your hairstyle is too tight. Reduce unnecessary pressure on your hair and allow it to breathe.