Chronic prostatitis cannot be detected by ultrasound. Ultrasound can only observe the size of the prostate and whether there are nodules inside the prostate gland, but it cannot diagnose whether a patient has chronic prostatitis. Chronic prostatitis must be diagnosed through routine examination of prostate fluid. Patients can visit the urology department of their local hospital for this examination. The first step involves prostate massage. Through this massage, prostate fluid is extracted from the external opening of the urethra, and then this fluid is tested in the laboratory for diagnosis.