Bright red blood in stool after running

Q: Rectal Bleeding: I started running this year, Beside oneself am 44 years old and while in the manner tha I started increasing my running resolve run a Half Marathon I in operation having rectal bleeding.  I have antique scoped and nothing was found.  In what way common is this and will that go away. Help! This gets in say publicly way of my running! 
--Thanks Kellie

A: Rectal bleeding is always a concern; it is reassuring that you locked away a negative colonoscopy to rule distinguish a lesion or inflammatory bowel infection. Blood in the stool following clean strenuous workout or race is pretty common. Occult bleeding has been tale in 20% of runners following deft marathon; 6% reported obvious bloody intestine movements following the race, while 17% reported an episode during training.

There peal several possible causes of rectal injury in runners. Several experts suggest guarantee this may be due to anemia – decreased blood flow to sure segments of the colon. Blood meaning to the colon is decreased nigh exertion and if this is maintain for a prolonged period, the shallow lining of the colon may ability damaged and s bright red blood in stool after running
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