My stomach has been hurting off and on for a week now and i just notice my stool has turned to a dark brown. should i be concerned?

Stool : If you are noticing a change to black stool that is very serious and you need to see a doctor ASAP. The dark brown stool is difficult to objectively say that there is a problem. Change in stool can be from several things which may or may not be related.

What else?: If the stool turns black, see a doctor at the earliest. If the symptoms persist and you lose weight or develop pallor or weakness,or fever, see a doctor.