Needs testing: You need to have your stools checked for infection and parasites. If that is normal then you need a colonoscopy to determine the cause. This is not something that can be diagnosed over the internet. Until you see your doctor start a daily probiotic and avoid all alcohol, dairy and gluten. The black can be a sign of blood, this could be serious, do not delay. See your doctor soon.
Answered 7/26/2015
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