Possible reasons for testicles being high on one side and low on the other: First, cryptorchidism or retracted testis is mostly a congenital developmental abnormality and is commonly seen in children under 6 weeks of age. If there is an empty scrotum on one side, cryptorchidism may be considered. If sometimes the testicles can be touched, sometimes the testicles can be touched, something cannot be touched, or both sides are asymmetrical, then consider retracted testis. It is recommended to go to a specialized hospital for examination or ultrasound to rule it out. Secondly, varicocele is most common in young men, mostly on the left side. The left testicle is lower and the right is in a normal position. The varicose veins cause the scrotum to droop and the testicles to fall, and the testicles on both sides are not equal, except the testicles are not in the same position, and the blood vessel mass or lump can be touched in the scrotum, which is usually painless. It is recommended to perform ultrasound examination of the spermatic cord to rule out the combination of varicocele. Thirdly, testicular torsion, when one testicle is torsioned, the position is elevated upward and the position of the normal side is drooping, except the position is not equal, it may also be accompanied by pain in the testicle and scrotum or groin area on the elevated side, and the pain gradually increases with time. This is a urological emergency and requires immediate medical attention, specialist examination, and a color Doppler examination of the spermatic cord to rule out torsion of the spermatic cord or testicles.