Can stuffiness and runny nose be related to teething? Little man has had a cough and runny nose for about 3 weeks now. Seems like it's post-nasal drip that's causing the cough. They put him on allergy medicine which I don't like because it's only for at night and it makes him drowsy but it does help him sleep through it and breathe better. Can't hear him snoring like I could before. We just got it refilled because it's been going on for so long. His top two teeth broke through and are really coming in and he already has his bottom ones but they're not completely in yet. I'm assuming the doctors right and it's teething but I was also told by another doctor that "you can't blame everything on teething" so I'm confused.