The main reasons for less nasal hair are as follows: 1, some patients may have congenital factors, genetic factors, born with less nasal hair; 2, some patients have chronic nasal vestibulitis, nasal vestibular eczema, resulting in nasal vestibule localization is not very suitable for the growth of nasal hair; 3, some patients have bad habits, often picking the nose, digging the nose, resulting in the nasal vestibule as well as the front of the nasal cavity of the mucous membrane of repeated infections and stimulation, the nose hairs are not easily Growth; 4, some patients have allergic rhinitis, perennial sneezing, runny nose, itchy nose, such patients are not very suitable for the growth of nasal hair environment; 5, some patients have chronic sinusitis stimulation, long-term nasal flow of yellow pus nasal discharge, the growth of nasal hair is not suitable for the environment; 6, individuals such as nasal tumors, tumors from the back of the nasal cavity to the front of the nasal cavity, blocking the nasal cavity all the nasal hair in this case is cannot grow.