The development of the human body is not completely symmetrical, due to the different time and length of the testicles descending into the scrotum on both sides, there are differences in the size of the testicles on both sides, but as long as they are within the normal range, do not worry about it. A normal male should have two testicles, and they are located on the left and right sides of the scrotum, and there is a certain difference in the size of the testicles on the left and right sides, the testicles on both sides are not the same size, generally speaking, the testicles on the right side of the male will be slightly larger than the left side, calculated by the length, width and thickness of the testicles, the average right side is 3.38cmX2.37cmX1.78cm, the average left side is 3.30cmX2.27cmX1.71cm If the difference between the two sides of the testicles is particularly large, we should consider whether there is a lesion. The common testicular size difference between the two sides is seen in the following aspects: First, some people will have congenital dysplasia, the size of the testicles on both sides will always be different, the difference is also more obvious, mostly manifested as: one testicle is very small and soft, such as toddler-type testicles, while the opposite testicle can have compensatory enlargement, larger than the average normal. Second, if one testicle suddenly increases in size, accompanied by fever and local redness and pain, it may be epididymitis or orchitis, which requires a timely urological examination, local ultrasound and blood tests to further clarify the diagnosis and treatment. Third, some trauma can also cause the size of the testicles on both sides to be different. After local trauma, hematoma and bleeding may be caused in the testicles, thus causing testicular blood supply disorders, resulting in testicular atrophy, so the affected side is smaller than the opposite testicle. Fourth, in addition, if one side of the scrotum has enlargement, it may also be mistaken for an enlarged testicle, commonly seen in cases such as testicular syringomyelia or scrotal effusion, which requires prompt medical attention and may require surgery if necessary. Don’t mind the size of the testicles too much, as long as they are in the normal range and there are no problems with testicular function, there is no problem. However, if the testicles are found to be significantly enlarged, it is still recommended to actively seek medical attention and improve the examination to clarify the diagnosis.