Physiology
For a fraction of a second the performer inhales strongly, pulling mucus from the outer part of the nasal cavity higher up, even into the sinus. This action is generally repeated every few seconds or minutes.
Sniffling and runny nose need not come associated with sneezing or coughing.
Sniffling is not necessarily related to illness. In addition to allergies and colds, it can be a result of being in cold temperatures, and a way to hold back tears.
Reducing the need to sniffle generally involves reducing the mucus-causing symptoms, i.e. through antihistamines or decongestants. More immediate relief is had by either nasal irrigation or blowing the nose into a facial tissue or handkerchief.
Read more about this topic: Sniffle
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