Prostate cancer patients are mainly older men and rarely seen under the age of 50; factors causing prostate cancer include heredity, animal fat diet and lack of exercise, etc. Sunlight exposure is negatively correlated with the incidence of prostate cancer; green tea may be a preventive factor for prostate cancer. Early prostate cancer is asymptomatic, but symptoms similar to lower urinary tract obstruction or irritation occur when the tumor invades or blocks the urethra or bladder neck opening, and in severe cases, urinary retention, hematuria, bone pain, pathological fracture, anemia, etc. Rectal examination and PSA screening are the main steps in diagnosing prostate cancer. If the above tests are suspicious, a prostate puncture biopsy is usually required to confirm the diagnosis. It is recommended that men over the age of 50 receive annual rectal examinations and PSA screening. A normal value of less than 0.15 for density will help distinguish between PSA elevation due to prostate enlargement and prostate cancer. A rate normal value of less than 0.75 is more appropriate for younger patients with a lower PSA. The diagnostic positivity rate for punctures of more than 10 needles is significantly higher than for less than 10 needles and does not significantly increase complications The interval between repeat punctures is usually 3 months, and caution should be exercised for more than 3 punctures.