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About testicular cancer

Testicular cancer is cancer that develops in the testicles, which are part of a man's reproductive system.

Who gets it

Younger men are more likely to get testicular cancer. Almost half (50%) of those who get it are under 35.

Men in their early 30s are the most likely to get it. Men over 55 are the least likely to get it.

The testicles

The testicles are two small oval shaped organs which hang below the penis in a pouch of skin called the scrotum.

Diagram of the testicles


From the age of puberty the testicles produce sperm.

The collecting tubules inside the testicle join together to form a tube called the epididymis. This tube carries on and gets wider as it leaves the testicle. The wider tube is called the spermatic cord.

The spermatic cord forms a short tube called the ejaculatory duct. This duct opens into the urethra (the tube from the bladder to the end of the penis).


The testicles produce the hormone testosterone. Testosterone develops male qualities like:

  • a deep voice
  • beard growth
  • muscle development
  • the ability to have an erection
  • male sex drive (libido)

    Where it starts

    The testicles are made up of different types of cells. The type of cancer you have depends on the type of cell the cancer starts in.

    Most testicular cancers develop in the cells that make sperm, called germ cells. The 2 main types of cancer that start in germ cells are:

    •  seminoma
    •  non seminoma

    How common it is

    Testicular cancer is rare.

    In the UK around 2,300 men are diagnosed with testicular cancer each year. That's about 1 out of every 100 cancers (1%) diagnosed in men.

    Last reviewed: 
    09 Sep 2014
    • Incidence statistics from the Cancer Research UK Cancer Statistics Team

    • Anatomy and Physiology in Health and Illness (11th edition)
      Ross and Wilson
      Churchill Livingstone, 2010

    Information and help

    About Cancer generously supported by Dangoor Education since 2010.​