Testicular cancer—cancer that develops in the male reproductive organs called testes—is relatively uncommon, affecting 1 in 250 males at some point in their lifetimes. That said, the incidence of testicular cancer has increased over the past few decades. This April, SIU Medicine honors Testicular Cancer Awareness Month by sharing some important facts you and your loved ones should know about this health condition. Testicular cancer has symptoms—so don't wait to get checked out Testicular cancer usually affects only one testicle. It can present with signs and symptoms including: A lump, growth