Men with yellow pubic hair are considered to be related to heredity, anemia, malnutrition, hormone level imbalance, albinism and other factors. 1. Heredity: The father or the grandparents in the family with yellow pubic hair are affected by genetic factors, and their offspring may have yellow pubic hair. 2. Anemia: patients with iron deficiency anemia, if the anemia is more serious, may have emaciation, whitish complexion, hair loss, yellow hair and other manifestations. 3. Malnutrition: Long-term poor eating habits, frequent partiality and picky eating, excessive weight loss, resulting in insufficient intake of nutrients and malnutrition. It will have an impact on hair growth, resulting in soft hair and yellow color. 4. Hormone level imbalance: too much or too little thyroid hormone secretion may lead to abnormal hair follicles and yellow hair. 5. Albinism: Albinism, which may lead to localized changes in skin color, may also lead to whitening of the skin and hypopigmentation of the hair. The above symptoms may also be caused by other factors, and patients are advised to go to regular hospitals for timely consultation and treatment.