I have had pain and swelling on the back lower left side of my head for the past few days. I assume this could be enlarged lymph nodes. They are very sore and hard. I know that swollen lymph nodes often result when the body is fighting an infection. But what kind of infection could cause swelling in this location, and only on one side? I don't have any upper respiratory symptoms. I didn't take my temp but don't feel feverish. Any ideas? It won't be easy to get to the doc today and maybe not tomorrow, as we're having a big snowstorm. Is it ok to wait this out, or is it something I should really be seen for ASAP?