What is the reason for a small testicle?

Testicle is a male external reproductive organ, a total of two, located in the scrotum, in life there are many male friends inadvertently found their two testicles a high and low, so worry about what disease. Normally, testicles a big small, a high and low, the gap is not too big, this phenomenon may belong to normal physiology. Testicle is a pair of oval substantive organs, smooth surface, adult testis length 3.5-4.5cm, width 2-3cm, thickness 1-2cm, each weight of about 20g, if the difference between the two sides is not too big, generally little effect, if the difference between the two sides is too big, may need to pay attention to acute epididymitis, hernia, tumor and other diseases. Suddenly showed a significant increase in one side of the scrotum, should be timely to the hospital for examination. If enlargement is accompanied by fever or localized abdominal pain, it may be epididymitis or orchitis. If enlargement is not accompanied by any symptoms, be careful about the possibility of testicular tumors.