Short gray hairs are always born on the head, which may be caused by physiological factors, genetic factors, mental factors, and pathological factors. 1. Physiological factors: with the gradual increase in age, the hair follicle melanin decreases and gray hair may appear. Due to the metabolism of the human body, there is a certain amount of hair loss every day, there will also be a certain amount of hair growth, resulting in the head is always born short white hair. 2. Genetic factors: some patients always have white gray hair on their heads, which may be caused by genetic factors, such as leukocoria, progeria, etc. 3. Mental factors: mental factors, such as sadness, depression, fear, emotional excitement, long-term emotional tension, etc., may lead to gray hair. 4. Pathological factors: Vitiligo occurs in the scalp, which will affect the local melanin synthesis, resulting in the birth of short white hair on the head. Tuberculosis, pernicious anemia and other chronic wasting diseases may also cause white hair. The short-term appearance of obvious white hair situation suggests timely to the regular hospital, exclude pathological factors, comply with the standard treatment, so as not to cause serious adverse consequences of the disease.