Often from the nasal cavity out of sputum, should refer to the sputum sucked back through the nasal cavity, the common diseases include chronic simple rhinitis, chronic sinusitis, vasomotor rhinitis and so on. 1. Chronic simple rhinitis: This disease is commonly characterized by translucent mucus nasal mucus, and pus nasal mucus may be present when secondary infection occurs. The nasal mucus flows backward into the throat through the posterior nostril, which may cause throat discomfort, phlegm and cough. 2. Chronic sinusitis: this disease can be caused by infection, allergy and adverse physical and chemical factors stimulation leading to mucopurulent mucus and nasal congestion and other symptoms, can be accompanied by postnasal drip leakage of phlegm formation. 3. Vasomotor rhinitis: environmental factors such as temperature, air pressure, irritating gases can stimulate nasal symptoms. Nasal congestion, runny nose, sneezing, itchy nose and so on are more common, when more nasal snot can flow to the back of the nasal cavity to the throat, forming sputum. Frequent sputum from the nose needs to actively seek medical attention, systematic examination to clarify the diagnosis and causes.