Don't forget that there are disks in the neck. You can get arthritis in the neck and the disks wear down, or a ruptured disk, and an area will get inflamed and impact on a nerve cluster - resulting in pain. You have to think if you might have a pre-existing condition that is being aggravated by wearing a helmet and holding your head up at a different angle than normal. If you really think it is just a cramp or muscle ache, then no big deal. But if there is the possibility of something going wrong in the neck, then you should see your doctor and explain your symptoms.

Darcy