I went out last week for the first time this year and almost instantly got a sharp, specific pain in the lower left side of my neck where it meets the shoulder. I realized that the pain was familiar-- I was getting it a lot last year too. It remained (lessening) for nearly five days!
My bike was fitted when I got it five years ago and I haven't messed with it. I can't figure out why it's only one side either.
Any ideas?