It is most likely the red wine that is causing the black stools but get checked out if it doesn't go away after not drinking wine for a couple of days.
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Go to the ER or call your doctor ASAP. Black stool could be varices bleed which can kill you. I know I survived an event of varices bleed but just about did not.
Drinking with hepc....YOU A FOOL...soory but i hope my words wake you the truth hurts...either that or you have no clue what hep c is
Black stool usually means there is some bleeding somewhere in the GI tract. See a GI doc ASAP !!! Drinking alcohol with Hep C can cause cirrhosis which can cause varices that bleed. Hope everything turns out ok