PSA is not a specific indicator of cancer, so PSA greater than 20ng/ml can not clarify the stage of cancer, mainly based on the patient’s specific situation, should be analyzed specifically. PSA is a prostate-specific antigen, if PSA is greater than 10ng/ml or between 10-20ng/ml, consider the possibility of benign lesions, such as benign prostatic hyperplasia, prostate hypertrophy, prostatitis. If the PSA is greater than 20ng/ml or even greater than 50ng/ml, the probability of cancer is higher, and patients are advised to pay attention to it. However, PSA alone cannot diagnose prostate cancer, and its specific stage cannot be clearly defined, and further examination, such as prostate biopsy pathology, is needed to confirm the diagnosis. If the PSA is more than 20ng/ml, patients are recommended to go to the medical oncology department of regular hospitals in time for examination, so that professional doctors can judge whether it is cancer or not and the stage of cancer according to the examination results, and make individualized diagnosis and treatment plan.