By Bad Seed
Genetic factors: Men who have a history of prostate cancer in their family, especially if it was a first-degree relative such as a father or brother, are at an increased risk. This risk may be two to three times greater than the risk for men without a family history of the disease. Earlier age at diagnosis (<60 years of age) in a first-degree relative and disease affecting more than one relative also increases the risk for developing prostate cancer.
Infection: Recent evidence has suggested the role of sexually transmitted infections as one of the causative factors for prostate cancer. People who have had sexually transmitted infections are reported as having 1.4 times greater chance of developing the disease as compared to the general population.
Diet: A diet high in fat has been associated with an increased risk of prostate cancer.
Chemical agents: Exposure to chemicals such as cadmium has been implicated in the development of prostate cancer. There is also some evidence to suggest that obesity leads to an increased risk of having more aggressive, larger prostate cancer, which results in a poorer outcome after treatment.