Hi. Thanks for your query. Noted your history of mild pain in left testicle and the thigh some 6 months back. Then you were diagnosed with Kidney stones and thought it is because of the stone. Now, however you see that testicles are almost always do not hang. Your query: What kind of doctor do I see? You have to see an Urologist. This is so as your problems are related to the testicles and kidney stones. The most probable reasons for your problem are: Hard testicles can be due to: Cancer Infection Post-torsion fibrosis. This can be very well diagnosed by a clinical evaluation and examination by an Urologist assisted by ultrasonography and color doppler examination of the scrotum and the whole abdomen for the genito-urinary system. I hope this answer helps you to et an early diagnosis and proper treatment.