I have snot. I'm sick?

I have snot. I'm sick?

In addition to SARS or, for example, allergies, the cause of snot may be in  reaction to the inhalation of cold, dry air and to the  cooling of the extremities . Or a runny nose that appears during physical exertion . In these cases, there is no pathogen like a virus or bacteria or an allergen, but a doctor may suggest treatment .