hi, some more questions.
1.which movement causes pain? is flex/ext. of the elbow or pronation/supination of forearm.
2.What kind of pain is it? sharp, burning etc.?
3.do you have free ROM?
4.can you provocate the pain?
5. do you have any loss of strength?
6. when contracting biceps, does it look different compared to the other side?
7. is the sensation more lat. or med. in the proximal forearm?
it would be really unusual if you biceps tendon lengthens so much after stretching it. a rupture would be more common. but maybe something else is wrong!!? Lig of elbow or lig. alaria. please descibe the region and answer the questions.
cheers