The normal volume size of the testicles is usually 15 to 25 ml, the length is usually 4 to 5 cm, the width is 2.5 cm and the thickness is 2 to 3 cm. Testicles are male reproductive organs and tissues, located in the male scrotum, there are a total of two left and right, generally in adulthood, the volume of male testicles will not change, the size of the size of the testicles is about usually considered as long as it is more than 12 ml, are considered normal, because the size of the testicles itself there are individual differences, and it is impossible to be exactly the same. However, if there is a large difference in the size of the testicles between the two sides, for example, one side of the testicle is small and the other side is too large is not normal, it may be due to diseases, such as epididymitis, testicular sheath effusion and so on. If the testicles cannot reach the normal size, you should go to the hospital in time for relevant examinations.