Although uncommon, cancer of the testicles (testicular cancer) is the most common cancer in young men in the UK. About 1 man in 500, aged between 15 and 50 years, develops testicular cancer. The exact cause is not known. However, if caught early it is one of the easiest cancers to treat and cure. So, If you are a teenage boy or young man, you should get to know how each testicle (testis) normally feels. Any changes would then be easier to detect. This is especially important for brothers of people with testicular cancer, as they have a higher-than-average chance of developing this type of cancer.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/getting-to-know-your-testicles