I've had a sore throat on the left side for about a month and the doctor can't find anything that would cause it.  Could it be referred pain?  I've had a few sniffles off and on, but more like that of allergies.  I'm reading on the Internet that quite a lot of people have this left-side-sore-throat phenomenon and nobody seems to know what causes it.  If it's referred pain, it's got to come from somewhere, right?  Is anybody looking at this?