What causes constant sniffing?

This swelling can be triggered by allergies (such as hay fever), irritants in the air (such as cigarette smoke, perfume or dust), and a viral infection (even before you have full-blown symptoms). People can also experience constant sniffling if they use a nasal spray to treat their allergies or cold symptoms.

Is it bad to keep sniffling?

So take a deep breath (through your mouth): The cause of chronic sniffling is often benign and usually treatable, Dr. Reisman says. Talk to your doctor about putting an end to your runny nose. Your tissue box might get a little lonely, but your coworkers will thank you.