Hair loss can be caused by incorrect shampooing or the use of inappropriate shampoo products, and may also be related to mental stress and sleep deprivation, in addition, if the nutritional deficiencies, it is also easy to appear the phenomenon of hair loss. 1. Incorrect shampooing: Some people wash their hair in an incorrect way, such as rubbing and pulling the hair with nails during shampooing, which can easily damage the scalp and hair follicles, resulting in a large amount of hair loss. 2. The use of shampoo products is not appropriate: if the use of shampoo products is not appropriate, such as the use of poor quality shampoo products, it is easy to produce scalp stimulation, which leads to a large number of hair loss, if you are allergic to the use of shampoo products, resulting in an allergic reaction, it is also easy to appear hair loss phenomenon. 3. Excessive mental stress, lack of sleep, etc.: If you are usually under too much mental stress and often lack of sleep, it is also easier for the phenomenon of hair loss to occur, resulting in hair washing and dropping a large amount of hair. 4. Malnutrition: If you don’t pay attention to balanced nutrition, resulting in a lack of vitamins and trace elements and other nutrients, the hair follicles may become flaccid, leading to hair loss when washing hair. If the phenomenon of hair loss may have other reasons, it is recommended to actively go to the regular hospital for relevant examinations, to clarify the causes, and comply with the doctor’s instructions for treatment, so as not to delay the condition.