The cause of testicular cancer is unknown, but genetics may play a role in determining risk.

Genes control the functions inside a cell. Special genes control how cells divide and grow. Cancer occurs when the damaged genes stimulate the cell to multiply out of control. The exact cause for this damage is unknown.

Examples:

• DNA
• Genes on chromosomes
• Cancer cells
• Cancer cell division

Cancer cells can develop from any cells inside the testicle. The cells can spread through the lymphatic system or the bloodstream.

Examples:

• Cancer cell metastasis
• Where testicular cancer spreads