The main difference between umbilical hernia and umbilical sinus is that an umbilical hernia is primarily due to the weakness of the tissues around the navel. When the intra-abdominal pressure of a patient increases, it can easily cause intestinal contents to protrude through the weak umbilical ring. On the other hand, an umbilical sinus generally refers to certain secretions that form around the navel after the scab falls off post-birth in newborns, which sometimes can easily lead to infections. This condition is not caused by weakness of the navel but is likely related to localized infections after the umbilical cord is cut. Therefore, the mechanisms of these two conditions are different. Generally, an umbilical hernia requires surgical treatment, while an umbilical sinus can be completely healed by controlling the infection, and it does not pose significant harm.