I'm pretty sure i've had a chronic sinus infection for a few years now. When I was a kid I was told I had narrow sinuses...I used to get ear infections pretty much any time i got sick. I find they don't drain properly. It always feels like there's liquid on one side. I can tell days it's worse, the area below my ear and jaw are warm to the touch and hurt to press.

It comes and goes. The breathe right strips mentioned by another commenter helps. I find it feels more clear the next day after using them.

But i've found the biggest thing that helps is paying attention to.my stress and the way I hold the muscles in my face. I find making a concious effort to takes some time to do some deep breathing and focus on relaxing the muscles around my eyes and my jaw really helps. A few days of keeping up with that and I findy breathing and pain and such go away.

I also find it to.be a good way to gauge my stress levels. When the sinus infection cones back and stays for a bit. I know i've been slacking with being mindful and letting stress get on top of me.

It may even be a post-viral syndrome, which is virtually impossible to detect.