What causes weakness in right arm compared to the left?
Patient: One in a while during the day but not every day for a few minutes I get what feels like my right arm is slightly less strong than my left. I work out almost every day with no problem. It just feels like there is very slightly less control but I can do everything . What do you think? I an 62. Have had stress tests,and all things heart related and all come out normal. What do you think? Doctor: Hello, I have studied your case. . Weakness in one arm with pain can be caused by either cervical spondylitis or rotator cuff tear.I would suggest you to meet a physician and confirm this diagnosis.  You might need to take MRI of the neck and shoulder to confirm the diagnosis.I hope this answer will be useful for you.  Let me know if there is any other followup questions. thanks for using healthcare magic.