In males, straining to lift heavy objects is primarily associated with the risk of developing an inguinal hernia. An inguinal hernia occurs when a portion of the intestine protrudes through a weak spot in the abdominal muscles, which can be exacerbated by heavy lifting and straining.
The other options listed—testicular cancer, an enlarged prostate, and infertility—are not commonly linked to straining while lifting heavy objects. While they can pose significant health issues, they are generally influenced by different factors.