Intestinal fistulas are holes in the intestinal wall separated from the free abdominal cavity, which communicate with the external environment or with other hollow organs.Intestinal fistulas occur as a result of various abdominal diseases and injuries. Most extrinsic fistulas occur, where intestinal fluid leaks out or into an abscess cavity. In this case, the intestinal passage is completely or partially broken. The amount of liquid in the intestine depends on the size of the intestinal fistula, the level of the intestinal tract, and the patient's diet. The higher the fistula is located in the intestinal tract, the higher the intestinal fluid, and therefore, water, electrolytes, oxygen, and enzymes.