I'm having really sharp pain in left arm stretching before lifting weights?

Vague complaint. Sorry to hear about your pain. Would you mind writng again with more info? - is it all the time? Is it in a specific location? With a specific stretch? Do you do a lot of repetition with your arms on a regular basis? Information like this will hopefully help us, help you. Other options for treatment may include rice, nsaids, , physical therapy, massage, etc...