Most people with a penis have two testicles in their scrotum — but some only have one. This is known as monorchism. Monorchism can be the result of several things. Some people are simply born with ...

When an otherwise healthy 16-year-old male leaned over trying to retrieve a golf ball, he suddenly developed pain in his lower left abdomen and then soon noticed that something was missing in his left ...

The human body is a machine whose many parts—from the microscopic details of our cells to our limbs, eyes, liver and brain—have been assembled in fits and starts over the 4 billion years of our ...

Possible causes of one testicle being bigger than the other include epididymitis, epididymal cysts, a hydrocele, testicular torsion, and more. Treatment depends on the cause. Self-exams can help ...

Testicular pain is pain you feel in one or both of your testicles. Your testicles are the two soft, round structures inside your scrotum, the sac of skin underneath your penis. Testicles make sperm ...