Hair extensions may cause hair loss. Hair extensions may cause stress to the scalp follicles and increase the probability of hair loss due to factors such as improper barber practices and difficulty in disassembly. 1. Pressure on hair follicles: When patients have hair extensions they add extra gravity to their own hair, putting pressure on the scalp follicles, which may lead to hair loss. 2. Difficulty in removing: Hairdressers usually use glue to fix the hair in order to avoid customers’ newly attached hair from falling off easily, but it can also cause the process of removing to be more cumbersome and violent, which can lead to excessive pulling of the hair and cause it to fall off. 3. Improper hair extensions: If the barber’s hair extensions are improper, it will lead to excessive pulling of the hair in the process of washing and caring, resulting in easy hair loss. For patients whose hair loss is caused by hair extensions, in addition to avoiding excessive hair extensions, it is recommended that they consult a regular hospital for treatment under the guidance of a professional doctor.