I have had pain in my testicles after I started Propecia. Is there a relationships?
There have been occasional reports of testicular pain on Propecia (finasteride). I have had thousands of patients using this medication and this has never crossed my path as a patient complaint, but some other doctors in the community have reported this as a suspected rare side effect. One doctor reported that the pain came on with the drug and disappeared when the drug was stopped, suggesting a relationship. It could have been coincidental. Most causes of testicular pain are caused by athletic stresses and for the young men, it may have something to do with puberty.
I would stop Propecia, wait a month and start it up again. If it happens a second time, then assume that this is a side effect of this drug for you.