What are other causes of a dull tesicle ache besides testicular cancer and varicocele?

Some viral: or bacterial infections, but tumors are not high on the list at all

Epididymitis: or hydrocele can also cause pain in the testicles, swelling from trauma, or even an infection near the scrotum can cause pain down there. It is best to see your MD if the pain continues, especially if there is a palpable lump on one of your testicles.

Here are some...: Mos men with testicular cancer or varicocele are symptom-free, but pain in the sac has been construed as pain in the testis and usually caused by infection or inflammation of epididymis resulting from bacterial UTI or STD-related urethritis, by post-injury from trauma or surgery for whatever is, or by the referring pain due ot regional disorders of muscles, joints, or nerves. ...

Abstinence: Or you may never find a cause. If your physical exam is normal, a referral to a urologist may be in order. Pain can be referred from a kidney stone or prostatitis, or a hernia may be developing. If it lasts for more than two weeks, by all means get seen.