Hair thinning is related to the kidneys, which is the theory of Chinese medicine. Chinese medicine says that the kidneys are open to the ears, and its Hua is in the hair, that is, older people have thinning hair behind the ears, so the kidney function will also decline, but Western medicine does not think so. Western medicine believes that the main reason for thinning hair is related to genetic factors. There are genetically caused androgenic alopecia, malnutrition alopecia, and hair loss due to seborrheic dermatitis as seborrheic alopecia, which are all diagnosed by western medicine for hair loss. In young adults, although the hair is thinning, some even baldness, but the kidney function is not reduced or changed, in the treatment can use blood nourishing hair capsule. Western medicine is now commonly used 2%-5% minoxidil tincture, twice a day in the morning and once in the evening, twenty-five points each time, but not more than two milliliters.