Why is my throat scratchy?

I've almost been afraid to myself, but the back of my throat has been itching all day. Almost as if I were about to come down with a cold.

Not surprising since I really pushed myself on my last run and then did a relatively hard 45 minutes on the stationery bike the next day. We'll have to wait and see.

My main concernis trying to do my run this evening. Not sure if I should risk it with a cold coming on. I will see how I feel when I get home.