Body hair loss in clinical dermatology is a very common hair disease, causing body hair loss for a number of reasons, the onset of the situation is also relatively complex. In the dermatology department the most common reasons are mainly the following: 1, and mental tension has a relationship. If mental stress or stimulated by fright or intimidation, it will lead to the loss of large areas of body hair, especially the hair is easy to form baldness. 2, and malnutrition is related. If patients are picky eaters, there will be a lack of trace elements and some vitamins, and a lack of iron and calcium will cause hair loss. 3. Long-term chronic anemia will also lead to the loss of body hair, especially in internal system and blood system diseases. 4. Kidney deficiency will also lead to the loss of body hair, especially kidney yin deficiency, which will lead to hair loss.