The past couple of days, I have noticed pain in my right testicle. I have read a thread on here earlier about wearing underwear that is too tight that may cause it, so I began to wear boxers the past couple of days. Does anybody know what may cause it? I read online about testicular pain, and I dont have redness, no blood in my semen or urine, and my left one doesn't hurt. Could it be a bruise? Does it sound like it may be serious?