The so-called analogy is to use the similarities between two different things to make comparisons, in order to highlight the traits and characteristics of things, can make the abstract, complex issues of life, concrete. Barrel and balloon: our abdominal wall is like a barrel, the peritoneum is like a balloon, the water inside the balloon is like the abdominal cavity organs, will be filled with water balloon into the barrel, with the hand pressure of this balloon, if there is a hole in the wall of the barrel, the water and part of the balloon will be protruding from the hole, forming a small bag. This thing is a hernia. Tires: the abdominal wall is like an outer tire, the small intestine is like an inner tire, and when the outer tire is broken the inner tire will bulge out. Clothing: When the outer layer of clothing is torn, the inner layer is exposed. Through the above analogy, it is not difficult to understand: hernia is a tear or hole in the muscle tissue of the abdominal wall, through which the patient’s organs or tissues, such as the small intestine, leave their original position and protrude from the surface of the body.