Another condition that may cause bloody stools is angiodysplasia, which mostly affects the elderly due to age-related weakening of the blood vessels and lower overall health. Angiodysplasia is a vascular abnormality that causes deformities on the colon walls. In most cases, it causes blood in the stool, as well as anemia due to low levels of hemoglobin in the blood. This secondary condition is associated with fatigue, weakness, shortness of breath and fast heartbeat.
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