Inguinal hernia (commonly known as hernia) is the most common condition in pediatric surgery. The incidence of inguinal hernias in children is about 3-7%. It is more common in boys, with a male to female ratio of 5:1. A hernia may not normally be symptomatic, but a soft mass may bulge out of the groin or scrotum when the abdomen is strained (e.g., crying, defecating, running, etc.) and is usually not painful. In girls, hernias are less obvious than in boys, and are often overlooked because they are simply a small bump in the groin when abdominal pressure is applied. Hernias are also often confused with syringomyelia (commonly known as scrotal effusion), but they are actually not quite the same. In terms of cause, if the lumen is large enough to allow the bowel to come out, it is a hernia, and if the lumen is small enough to allow only the ascites to come out, it is a syringomyelia. The surgical approach is much the same.