Many people only know that male pattern baldness is baldness, but they do not know that baldness also has sub-symptoms. Many people do not know very well about total baldness and pooch baldness, in fact, that want the seriousness of baldness caused by baldness. Total baldness refers to the loss of hair on the whole scalp or almost completely, and when the condition is serious, it can even appear other parts of the hair, such as eyebrows, beard, armpit hair, pubic hair and sweat hair all over the body are also lost, then it is called pooch baldness. However, after a long period of research, it has been found that the causes of alopecia are related to genetics, emotional changes (mainly depression, anxiety, fear, sadness, etc.), stress (such as car accidents, examinations, job hunting, promotion, surgery, trauma, etc.), endocrine diseases (such as hyper- or hypothyroidism, diabetes, etc.), autoimmune diseases (such as asthma, allergic rhinitis, atopic dermatitis, urticaria, etc.), and other factors. The causes of Pulmonary baldness are, on average, the same as those of other diseases (e.g. hypertension, vitiligo, psoriasis, etc.). The average person sheds about 50 hairs a day, which is a normal metabolism, and the number of hairs shed and new hairs born every day is approximately the same, so the hair will not thin out. However, if the number of hair loss exceeds this number, and the hair is significantly thinner than before, it is pathological hair loss. If the hair loss is not much, but the hair growth is very slow and the hair is thinning, it is the so-called pathological hair loss. There are many factors that cause pathological hair loss, both congenital or hereditary factors and acquired factors;; both physiological and pathological reasons. However, acquired factors, i.e. some pathological factors causing hair loss are the most common, such as some mental stress, acute and chronic infectious diseases, various skin diseases, endocrine disorders, physical and chemical factors, neurological factors, nutritional factors, etc., can lead to hair loss. After investigation, it is found that some patients’ have obvious family history, and if someone in the family has ever changed to total or universal baldness, this is also a strong evidence to support the genetic cause. In addition, it was also found that patients with total baldness and alopecia are more likely to also have nail damage, such as nail white spots, nail grooves, and transverse ridges, etc. The scalp tends to be smooth, and patients with parts of the scalp may experience itching, some may feel a slight pins-and-needles pain, and some may feel pain when pressing on the scalp. A survey of their quality of life also revealed that the negative impact of alopecia totalis and alopecia universalis on patients’ quality of life is much greater than that of patients with baldness and androgenic alopecia, especially for women. The healing process of alopecia areata and alopecia areata is worse than that of baldness, with a longer duration and more difficult recovery than that of baldness. After suffering from alopecia areata and alopecia areata, the most important thing is to relieve the mental burden, reduce the mental stress, avoid the stimulation of the external environment, and firmly believe in the treatment. In addition, you should pay attention to the combination of work and rest in your study and work, ensure sufficient sleep, and seek help from a regular medical institution.