(HealthDay News) -- Testicular tumors are among the more common cancers occurring in men under 40. Seton Hall University in New Jersey advises men to conduct regular self-examinations. Here's how:

• Support the testicles in one hand and feel each with the other hand.
• Gently roll each testicle between the thumb and the fingers. You'll feel a smooth tubular structure that covers the top, back and bottom of each testicle.
• With your finger, delicately separate this tube from the testicle to examine the testicle itself.
• Feel for any swelling or lumps.
• If you detect anything unusual, see your doctor without delay.