Digestive Health Guide: Enzymes, Probiotics & Intolerance

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Jogger running on trail through forest, low section

After Running I Experienced Stomach Cramps and Blood in Stools

Published Aug,14 2017 | By Chidambaram Sunder Valliappan

Tiny amounts of blood in the stools occur in about 20 percent of marathon runners, according to "Marathon Medicine." This occult -- or hidden -- bleeding is only detectable by laboratory tests. Visible blood in the stools plus cramping are much less common.