I have a scrotal hanging feeling, with heaviness that gets worse with activity.  Running, jumping, etc causes huge discomfort.  I wear briefs to support, but to no help.  MRI and Ultrasounds down their show very mild inflammation.  No hernia, clear on prostate, and cystoscopis (?) are negative.
It may be due to some mild infection. Use tight boxers. As all the tests are normal, so it is likely to subside with time.