Cause nasal secretion backflow old spit white sputum, belongs to the postnasal drip syndrome, may have chronic rhinitis, sinusitis, as well as nasopharyngitis and other related. 1. Chronic rhinitis: nasal mucosal edema, glandular hyperplasia, increased secretion, can cause white nasal discharge backflow leading to spit. 2. Sinusitis: manifested by nasal congestion, loss of appetite, thick runny nose, etc. Thick runny nose can flow to the throat and pharynx, stimulating the nasopharyngeal or pharyngeal mucous membrane, causing pharyngeal itching and spitting of white phlegm. 3. Nasopharyngitis: Nasopharyngeal mucosa and nasal continuity leads to nasal inflammation will spread to the nasopharynx, mucus secretion increases, backflow into the throat. If the nasal secretion backflow old spit white sputum situation continues not to ease, it is recommended to actively go to the hospital systematic examination to clarify the diagnosis, so as not to delay the condition.