One testicle hanging lower or being larger than the other testicle in males is a normal condition, according to WebMD. A painful or swollen testicle may indicate an infection, a hydrocele, varicocele, inguinal hernia or testicular torsion, a condition that requires immediate medical attention. Similarly, since a hard, painless lump on an enlarged or swollen testicle with a heavy sensation in the groin may point to testicular cancer, this needs medical evaluation.
Testicles are oval-shaped male sex organs, 1 inch wide and 2 to 3 inches long, located in a sac behind the penis, explains WebMD. They produce millions of sperm a day and store it. They also produce testosterone, a hormone that the body uses for development during puberty.
While testicular cancer only accounts for 1 percent of cancers in men, it is the leading cause of cancer-related death among men in their 20s and 30s, according to the McKinley Health Center. Caucasian men and men with a history of undescended testicles are most at risk. Since early detection may cure 90 percent of those affected, doctors recommend that men perform the testicular self-examination, or TSE, once a month to search for lumps. Not all lumps on testicles are cancerous, and a doctor can determine this through testing.