How to distinguish between infectious and non-infectious diarrhea

Patient's question:

The child has been crying non-stop recently and hasn't been eating much. How can infectious and non-infectious diarrhea be differentiated?

Doctor's answer:

Diarrhea caused by bacterial infection often contains mucus in the stool, and even purulent blood-like substances, with relatively small amounts of stool per bowel movement. Diarrhea caused by viral infection is typically watery and loose, with large amounts of stool per bowel movement, making dehydration more likely. Non-infectious factors often lead to dietary-related diarrhea. Indigestion is characterized by the presence of undigested food particles in the stool, without fever, and occasional vomiting. Allergic diarrhea occurs several hours to 1-2 days after consuming certain foods, with recurring episodes clearly linked to food intake. Climate-related factors are often associated with changes in weather or environment. In non-infectious diarrhea, stool tests are usually normal, and dietary adjustments or environmental changes can often correct the issue.

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