If it is diarrhea, then there could be a problem but then again it might be temporary. For example, you might have had a diet change. Or you might have a bug that will go away. But if you watch your diet and the problem persists for more than say 2 weeks, then it is time to see a doctor who will generally look at you and wonder what to say without looking too much at a loss. Then he might say give it some time and here are some tablets for the symptoms and see how you go. Then when you come back he might say let us do some tests. But really, the causes could be as many as you like and you could be searching a long time if this is the first time you had diarrhea.
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