A tear in the Medial Epicondylitis ( spell check needed ) will usually be the culprit on pain that is on the inside of the arm. This as many have said is very common when curling with a straight bar as it forces the Medial tendon into an unatural position causing it to do too much work.
One thing that has really helped me that a friend told me is to hold the wieght with a relaxed grip and to not bend the wrist during the movement, it is the tendency of many to turn the wrist inward during a curl that is the main cause of tendonitis when lifting wieghts is the culprit.
Hope this helps.
PS speaking or masterbation.. remember that shake wieght deal on TV? I always said if that type of motion worked every 12-14 year old boy would have at least one giant bicep!
Final PS...37.. damn GB to be 20 years younger again ;-)
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