The causes of epididymitis at a young age are related to the type of epididymitis, acute epididymitis is secondary to other diseases, medical factors, etc., and the causes of chronic epididymitis are acute epididymitis prolonged, long-term infections. 1. Acute epididymitis (1) secondary to other diseases: can be secondary to spermatitis, prostatitis, posterior urethritis, etc., the pathogen can be retrograde infection along the vas deferens. (2) Medical factors: such as indwelling catheters, improper use of instruments in the urethra, etc., often cause epididymitis. 2. Chronic epididymitis (1) Prolonged by acute epididymitis not completely cured. (2) Caused by long-term mild infection without acute phase. (3) Some cases are secondary to chronic bacterial prostatitis. In summary, epididymitis patients should go to the hospital in time, under the guidance of the doctor standardized treatment.