Final answer:
Testicular cancer is the most common cancer among men aged 20 to 39, accounting for about 1% of all male cancers. It's highly treatable, particularly when detected early, with treatments involving surgery and possibly radiation or chemotherapy. A history of undescended testicle(s) is the highest risk factor.
Step-by-step explanation:
Testicular cancer accounts for about 1% of all cancers in men but is the most common form of cancer for men between the ages of 20 and 39. It is characterized by symptoms such as a lump or swelling in one of the testes, sometimes mistaken for other conditions such as fluid buildup or infection.
This type of cancer, while generally rare, has a high cure rate if diagnosed early. Treatment typically involves surgery to remove the affected testicle, which may be followed by radiation therapy or chemotherapy if needed. Even after the removal of one testicle, reproductive functions can still be maintained with a healthy remaining testis.
The most significant risk factor for testicular cancer is a history of undescended testicle(s), known as cryptorchidism. Other potential causes, although less well understood, include genetic factors and environmental exposures.