Testicular cancer is a growth of cells that starts in the testicles. The testicles, which are also called testes, are in the scrotum. The scrotum is a loose bag of skin underneath the penis. The testicles make sperm and the hormone testosterone.

There are different types of Symptoms include:

• A lump or swelling in either testicle
• A feeling of heaviness in the scrotum
• A dull ache in the lower belly or groin
• Sudden swelling in the scrotum

It's not clear what causes most testicular cancers.

• Testicular cancer starts when something causes changes to the DNA of testicle cells. A cell's DNA holds the instructions that tell the cell what to do. The changes tell the cells to grow and multiply quickly. The cancer cells go on living when healthy cells would die as part of their natural life cycle. This causes a lot of extra cells in the testicle that can form a mass called a tumor.
• In time, the tumor can grow beyond the testicle. Some cells might break away and spread to other parts of the body. Testicular cancer most often spreads to the lymph nodes, liver and lungs. When testicular cancer spreads, it's called metastatic testicular cancer..

See your health care provider if you detect any symptoms that last longer than two weeks. These include pain, swelling or lumps in your testicles or groin area.