Acute eating disorders are a daily problem in pediatric practice. In acute eating disorders we include acute diarrhea, vomiting and dehydration. Diarrhea is a phenomenon of excessive loss of water and electrolytes through feces . Diarrhea is a symptom that the patient described as too much feces reduced density and increased volume. Usually these changes are combined. Vomiting is abundant gastric emptying, or the lower intestinal tract. With frequent diarrhea and vomiting, performs dehydration. Dehydration is the most important traffic disruption in the body of water - is more common in infancy than at any time in later life. Dehydration is a condition in which the body comes to a reduced volume of extracellular space. We distinguish between mild, moderate and severe dehydration, and isonatremic, hypernatremic and hyponetramic dehydration. The most common causes of intestinal infectious diseases (mainly Salmonella and Shigella, and Campylobacter jejuni and Yersinia enterocolitica) or their toxins (Staphylococcus aureus, Clostridium perfringens, Clostridium botulinum) and viruses (rotavirus is the most important). The causes may be parasites, and fungi. Acute eating disorder can be caused by emotional stress, intestinal infections, hypersensitivity to food, and some medications (iron, antibiotics). The source of infection may be another person (carriers), infected animals or food. Diagnosis is based on anamnesis, or in the case of children under heteroanamnesis - it should be noted the duration of diarrhea, appearance of the abdominal pain and how long it takes, whether it is with diarrhea and vomiting present fever , if there are any changes in the characteristics of feces. In the diagnosis of disease is an important physical examination. The most important thing is to assess the state of hydration of the body. It is important to do a complete overview of the child which must include examination of the abdomen, digital rectal examination. Conducted laboratory tests of blood, feces and urine, fluid deficit estimate the important data for the definition of the diagnosis and the degree of dehydration. Diarrhea and vomiting often lead to make greater loss of water and electrolytes and disorders of acid-base balance in the body. Therefore, every child with diarrhea, in addition of a anamnesis of the beginning, the number and appearance of the feces, should look through. Pay attention to the degree of dehydration, signs of disturbed acid-base balance and special signs hypovolemic shock. Knowledge of clinical signs will help the nurse in patronage to perform triage. Children with more severe necessarily refer to the doctor for review. The main measures of treatment are diet and rehydration. A treatment plan is selected on the basis of the data obtained: if there is no dehydration, if there is mild or severe dehydration without threatening hypovolemic shock, or if there is severe dehydration and is threatening or has already developed hypovolemic shock.