See below: Bright red blood mixed in with the stool, on the surface or passed separately is usually caused by an anal fissure: if no associated diarrhea, more than 90% of children with blood in the stools have an anal fissure. Anal fissures usually are caused by passage of a large or hard stool/constipation. Black tarry stools results from bleeding in the stomach area.
Answered 9/11/2017
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