Severe hair breakage and hair loss may be caused by improper shampooing and conditioning, lack of vitamins, fungal alopecia, baldness and other reasons. 1. Improper shampooing and conditioning: the use of shampoo and conditioner is not appropriate, combing the hair when pulling hair or tie hair too tight, will lead to hair breakage easily. The longer you wash your hair, the more oil you secrete, the more pores you may clog, resulting in damage to the hair follicles, which can also lead to hair loss and hair breakage. In addition, the chemical substances in the perming and dyeing cream may irritate the skin, causing skin malnutrition, resulting in fine hair, hair loss and hair breakage. 2. Vitamin deficiency: Lack of vitamin D and vitamin B12 may lead to lack of nutrients in the skin, and may also cause symptoms such as hair roots becoming thin and hair breaking easily. 3. Fungal alopecia: usually a fungal infection of the scalp, leading to the destruction of hair follicles, resulting in hair loss and breakage, and may also cause local itching symptoms. 4. Patchy baldness: related to genetic, autoimmune, mental anxiety and other factors, hair breakage and hair loss is serious. It is recommended to pay attention to work and rest, can be in the hospital after consultation by the doctor to guide the use of medication.