Hi...., I went through your query... The testicles are very sensitive. Even a minor injury can cause pain... Pain in left testicle and groin can be caused due to a number of reasons.....some of the causes include epididymitis, varicocele,
kidney stones, hernia.... Rest and protect the sore or injured groin region for up to 2 weeks.... Cold reduces swelling and pain. Immediately apply cold pack or ice for reducing the swelling....Consult your Urologist for further evaluation and treatment....