I usually have various shades of brown colors, sometimes dark pellets, but can stool suddenly turn dark brown? I am easily scared by any changes and often cover the bristol stool scale back and forth. Dark diarrhea scared me the other day and now it's back to solid, but still really dark brown. I was hoping it will go back to where it was before. This happened a day after I had a dinner of spicy Indian food, which I'm not used to eating. Is this something to be concerned about?