Hi. Thanks for your query. If the pain in the has started only after the a lot of exercises, this can be connected to the Gym activities. The probable causes can be as follows: -Straining of the Cremaster muscle which supports the testes and comes as an extension of the abdominal muscles . The strain on this muscle can cause the testis to get elevated and rotated hence causing the pain and swelling you have. -Pre-existing orchitis can get enhanced with the exercises. I would advise you the following: -Physical Examination by the General Surgeon or Urologist. -Ultrasonography and color doppler examination of the scrotum and urogenital system -Scrotal support during exercises.