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Since when is he having diarrhea?
How many times does he pass stool in a day?
Does he have fever, abdominal pain or any other symptom?
He is probably having gastroenteritis or infection of gi tract. In most cases it is viral. Sometimes bacterial & other infections can be there. Those can cause blood to pass & pain in rectum. I would advise to get an examination by doctor. Stool testing, antibiotics can be needed. Please try to give plenty of fluid & electrolytes like oral rehydration fluid,gatorade starting in small frequent sips . Rice, banana, toast will be helpful. Urine output should be watched too. If it decreases it can suggest dehydration.
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