Age: Most prostate cancers occur after the age of 50, and about two-thirds of patients are over 65 years old; 2. Family history: It is recommended to start prostate cancer screening at the age of 45 for those who have prostate cancer in their family members; 3. Ethnicity: The incidence rate of black people in the United States is nearly one times higher than that of white people, while the incidence rate of Asian people is lower, but in recent years, it also shows an increasing trend; 4. Diet: High-fat diet, especially a large amount of intake of animal fat, increase the risk of prostate cancer. In addition, the relationship between prostatitis and prostate cancer is still unclear, and sexually transmitted diseases may increase the risk of prostate cancer.