You are 16 years old and you have one testicle bigger than the other does it mean cancer?

Not necessarily. It is common for one testicle to be larger than the other, even in healthy individuals. However, if you are concerned about the size difference or if you notice any other changes in your testicles, it is important to see a doctor to rule out any underlying medical conditions. The doctor may perform a physical exam and order imaging tests, such as an ultrasound, to determine the cause of the size difference. Depending on the results of the tests, the doctor may recommend treatment or further monitoring.