Question for the men about our man parts.

This is about my testicles.

At random times I experience a small amount of dull pain that is very reminiscent of “blue balls” (roughly one quarter the level of pain, i.e. annoying, but I’m not in agony. Also, unlike BB’s the pain {dull ache to be more precise} often ceases within 15 minutes). It seems to only happen in the left one. The strange part is I’m not sexually stimulated at all when this happens, much less “backed up”. Could this be a symptom I’ve never heard of for nut cancer or some other health issue? I am going to see my doctor next week, but in the meantime I thought I’d see if anyone here has heard of or experienced this.

I am in my late thirties.