About a year ago, I started feeling a mild pain when I would shrug my shoulders, rolling my collarbone forward. It is only on the left. I thought the pain was coming from the clavicle itself but now I realize it must be the muscles through my neck and shoulders, too. I didn t address it because I assumed it was from sleeping funny and would resolve on its own. Instead, a year later the pain has gotten worse but still only when I am making a lifting, shrugging motion. It s probably not anything so serious but my dad had thyroid cancer and good old web md listed that as a possibility of this type of discomfort. I will make a doctor s appt but in the meantime would appreciate input. Thanks.