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Black stool may be an indicator of bleeding in your gut, which should not be caused by IBS. This could be an ulcer. If you feel unwell, look pale or have a fast heartbeat, you should go to the er immediately. if you feel fine, then it's reasonable for you to contact your doctor by phone and see if they have any input as they know your medical history and have examined you in the past. I would bring a stool sample so that it can be checked for microscopic blood (this can be done in the office)
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