For me it is usually cold dry air that seems to cause post-nasal drip. Once I get that, it's a good chance I will get a sore throat, and it goes from there. Be

For me it is usually cold dry air that seems to cause post-nasal drip. Once I get that, it's a good chance I will get a sore throat, and it goes from there. Being outdoors is usually fine, but sleeping under a strong AC or driving in the cold with windows down is almost a sure fire way to get this started.