The whitening of male pubic hair may be caused by physiological factors, lack of nutrients, and mental and psychological factors. 1. Physiological factors: when men age, pubic hair may appear physiological whitening, is a normal physiological change, usually not accompanied by other clinical manifestations. 2. Nutritional element deficiency: long time partiality and picky eating, resulting in the lack of nutrients in the body, may lead to pubic hair and hair white or yellow, may also be accompanied by body thinning, poor physical condition and other abnormalities. 3. Mental and psychological factors: men in the work and life of mental and psychological pressure, long time sleep quality is not good, but also easy to make the pubic hair and hair and other parts of the hair white, may also be accompanied by dizziness and fatigue and other symptoms. Men with white pubic hair and other abnormalities, it is recommended to seek medical examination and treatment to avoid adverse effects.