your neck is full of muscles, ligaments and tendons that can be pulled or stiffened easily - could it be a muscle? It the pain constant or does it hurt more upon movement?
Do you have a fever? An infected lymph node is a possibility but you would probably be running a fever, especially if it as an emergent situation.
Cancerous lymph nodes usually do not hurt, FYI.
It might be a tumor.
If it's not an emergency, then why all the going on about it?
Let's go ahead and use that 18$ to get some excitement going in here.
Jam a needle into it. A good bleeding will help relieve those swollen buboes!
I was breaking up ice and shoveling snow yesterday. I'm guessing that I pulled a muscle in my neck as R9 suggests.
You have a cold sore coming on, that is all, and who cares?
I am never wrong about these things.
It will give you something to post about tomorrow!