Although chronic inflammation is a cause of tumorigenesis, no evidence has been found in reports worldwide that chronic prostatitis can lead to the development of prostate cancer. The etiology of prostate cancer differs significantly from that of other cancers in that dysregulation of androgens is directly related to the development of prostate cancer. A survey of living eunuchs from the late Qing Dynasty found no examples of them getting prostate cancer, and worldwide studies have found that castrated people do not develop prostate cancer, suggesting that androgens play an important role in the development of prostate cancer. It is now recognized in world medicine that blocking androgens has a good therapeutic effect on prostate cancer. Studies have found that prostate cancer is also related to ethnicity, genetics, and environmental factors. The incidence of prostate cancer varies considerably by race, with the highest incidence among Caucasians and Blacks, increased incidence among yellow immigrants to Europe and the United States, and the lowest incidence among Asian races. A high-fat diet and obesity may also be a cause of prostate cancer, and several studies have confirmed that consuming too much animal fat is associated with prostate cancer. Because of the presence of androgens in men, there is no way to completely prevent the development of prostate cancer. The only thing that people can do is to pay more attention to their diet in hopes of reducing the likelihood of prostate cancer. For example, older men should eat less meat, more low-fat foods, soy-based foods, vegetables and fruits, and exercise regularly to improve their health.