Hi from yesterday I have dark brown stool and little bit stomach pain and back pain is it any problem?

YES. Yes, it could be something as simple as gastritis which can present as stomach pain and also sometimes radiate to back or it can be something serious. I recommend that you take otc pepcid, (famotidine) avoid alcohol and keep an eye out for continuing symptoms. If no improvement in a day or two, see your physician.

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