Recurrence of prostate cancer includes biochemical recurrence and clinical recurrence. Biochemical recurrence means that the patient does not have any conscious symptoms, but only shows elevated prostate cancer-specific antigen, and the elevation of prostate cancer-specific antigen >0.25ng/L or above suggests the existence of biochemical recurrence, but at this time the patient does not have any symptoms. Clinical recurrence means that the patient has the corresponding symptoms, and then the examination finds recurrence, such as the appearance of hematuria, there may be prostate cancer recurrence, because after the recurrence, the prostate cancer tissue destroys the parenchymal cells and produces hemorrhage. Pain is also an important symptom of prostate cancer recurrence, as the prostate cancer destroys the surrounding tissues after the recurrence, it will produce the symptom of pain in the perineal area. Difficulty in urination is also a symptom of recurrence. After the recurrence of prostate cancer, the urethral canal will be blocked, causing the patient to have difficulty in urination, and then the patient will have difficulty in urination, or even the symptom of urinary retention. Symptoms of distant organ metastasis, such as pain in the sacrococcygeal vertebrae or lumbago, are the symptoms of bone metastasis caused by the recurrence of prostate cancer.