Pus from the nostrils is usually caused by diseases such as rhinitis. There are many causes of pus in the nostrils, such as eating hot and inflammatory food, or having sinusitis, which is often formed due to incomplete treatment or repeated attacks. Therefore, patients in the treatment of pus in the nostrils, need to go to the regular hospital to choose the scientific treatment, so as to identify the cause of the disease as soon as possible, timely and symptomatic treatment. The main causes of nostril pus are: 1, colds: initially watery or mucus, and pus can appear in the late stage of colds. 2, chronic rhinitis: the nasal mucus can be found in the nasal mucus. 2, chronic rhinitis: nasal mucus snot, the amount can be more or less. 3, allergic rhinitis: for the flow of watery runny nose, the amount of more, accompanied by sneezing, nasal itchy feeling, perennial attacks, can also seasonal attacks, allergic rhinitis patients can be accompanied by asthma, especially children. 4, chronic sinusitis: mostly mucopurulent secretion, bilateral or unilateral, accompanied by nasal congestion, dizziness, memory loss. Unilateral sinusitis should be considered as odontogenic sinusitis. 5.Nasal polyps: it can also be accompanied by running water and pus when it is infected, which can be accompanied by nasal congestion, dizziness and memory loss. 6, pediatric secretion is more vigorous: if there is no other discomfort, may be caused by cold air stimulation of the nasal cavity, do not need special treatment. Unilateral nasal congestion with blood in the snot may be caused by foreign bodies in the nasal cavity.