What should I do if I have yellow phlegm all over my nose? First of all, we have to correct a concept that yellow phlegm should not appear in the nose. The so-called phlegm is produced by the respiratory tract, that is, the secretions produced by the bronchi and the lungs are called phlegm, and those produced in the nose are called “snot”, which should mean that the nose is full of yellow snot. If there is a lot of yellow snot to deal with snot, if it is not good to blow, you can use saline with a syringe (of course, the needle should be removed) to spray into the nasal cavity, head slightly back a little, there are also sold on the market sea salt water, spray a little to clean the nasal cavity, easy to clean yellow snot. For the cause of pus snot to do a treatment, if it is a cold, cold late nasal snot will also become yellow pus snot, the main treatment of the cold can be, the cold is well, drink more water, more nourishing the local nasal cavity, do local cleaning of the nasal cavity, soon get well. To rule out the presence of rhinitis or sinusitis, there will also be yellow pus. If you do not have a cold, it is recommended to go to the ENT department to find a specialist to confirm the diagnosis, whether there is rhinitis as well as sinusitis, and then give certain treatment according to the relevant diagnosis.