rib spasms

I was dx. in 09 nsclc stage 111A, finished treatments in 2010, chemo/rad/attempted surgery to remove url, was not possible due to tumor location. been monitored since that time and all ct scans have been clear. I recently had a ct scan, chest, abdomin, pelvis and that was clear also.  I have noticed ever since treatments ended I have been experiencing rib spasms on the right side same side as the tumor location. (upper right rib) It is not consistant, but is enough to become bothersome. I was wondering if anyone else here has experienced this since after treatments.  Any info or input would be much appreciated. Thanks in advance.