Diarrheal diseases are a major health concern for children, especially in areas affected by disasters. Inadequate sanitation, contaminated water sources, and poor hygiene heighten the risk. Timely diagnosis and treatment as well as prompt case identification minimize adverse outcomes and enable the implementation of preventive measures essential for outbreak management. In disaster settings diarrhea can present as three severe clinical conditions namely acute watery diarrhea, acute bloody diarrhea (dysentery) and persistent diarrhea lasting beyond 14 days. Acute watery diarrhea is usually well managed with oral rehydration therapy (ORT) and zinc sulfate. Establishing ORT units quickly in disaster settings is vital for treating dehydration. Using the Integrated Management of Childhood Illnesses Guidelines, healthcare workers can classify dehydration levels and provide appropriate care. If acute, painless watery diarrhea occurs, particularly in adults, cholera should be suspected. Early outbreak management is crucial due to cholera’s status as a public health emergency. Antibiotics are indicated for dysentery, the choice of which should be guided by local sensitivity patterns where available. Children with concurrent malnutrition and diarrhea require integrated care addressing both conditions, including nutritional rehabilitation, infection control measures, and micronutrient supplementation.