The differential diagnosis of inguinal hernia is generally distinguished from direct hernia of the groin, testicular syringomyelia, traffic syringomyelia, and spermatic cord syringomyelia. Take testicular syringomyelia as an example, testicular syringomyelia mainly accumulates fluid inside the scrotum and manifests as a mass in the scrotum, which is very similar to the groin, so it should be differentiated. Because testicular syringomyelia is a mass with soft texture and no pressure pain, the mass is translucent when illuminated with a flashlight, while hiatal hernia is not translucent. The testicular syringomyelia cannot be returned and is still inside the scrotum. If it is a traffic syringomyelia, the traffic syringomyelia is also inside the groin or scrotum, but it can be slowly returned to the scrotum by lying down. The spermatic cord syringomyelia is also a positive transillumination test.