The causes of black hair roots and white hair tails include malnutrition, anemia, vitiligo, and anxiety disorders. 1. Malnutrition: due to malnutrition, the hair lacks enough melanin, and the phenomenon of black hair at the root and white hair at the end can occur. 2. anemia: when the patient blood loss is too much, the nutritional supply of the hair is insufficient, then there will also be the root of the hair black hair tail white symptoms. 3. Vitiligo: because the environment and other factors lead to the patient’s melanin production is insufficient, this time the hair lack of melanin so part of the white. 4. anxiety: due to long-term anxiety, endocrine disorders, will also affect the production of melanin, the hair will be white. Finally, if you have black hair roots and white hair tails, please consult a doctor in time.