There are several common cases of purulent nasal discharge, one is the common cold, the first 3-5 days is clear nasal discharge, like water, after a few days there will be nasal discharge turn pus, turn white, appear a lot of pus. This is the process of viral colds, signaling that the cold cycle is about to pass, usually within two weeks, the pus nose will disappear, and the cold is cured. There is also a situation where the pus runny nose is prolonged, considering the possibility of sinusitis or chronic rhinitis. Especially sinusitis, accordingly, because the infection site is more hidden, often take antibiotics or after treatment is not easy to get better, easy to appear longer runny nose. At this time, it is recommended to go to the ear, nose and throat department to carry on the cleaning of the nasal cavity, and even the cleaning of the nasal passages. If after systematic formal treatment still can not get better, it is recommended to do sinus CT or MRI, to see if there are other problems inside, or cause secondary other diseases. So the pus nasal discharge is to be actively treated, if the old time is longer, the delay does not heal, it is best to go to the otorhinolaryngology department for a systematic examination and diagnosis, for the cause of the effective treatment.