红色或者黑色的大便虽然可能是药物或者食物造成的，但也可能是肠道出血的结果。 虽然粪便颜色异常确实是健康出问题的征兆，但是在大多数情况下，这些异常都是一些小问题甚至是食物引起的。 如果你因为粪便颜色异常而感到担心，可以去医院看看。 在大便颜色出现异常的同时，你是否还出现了其它症状？如果你同时伴有腹痛或者突然腹泻，那粪便颜色异常可能就不是食物引起的这么简单的了。

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Even though these colorations could be caused by dietary changes or medications, these colors could also be indicators of blood in the intestinal tract. If you have blood in your stool, or are actively bleeding when you have a bowel movement, seek medical attention as soon as possible. If your stool is bright red or black and you recently ingested anti-diarrheal medications, food with red dye in it, or started a new medication, make an appointment with your doctor to make sure the change in your stool color isn’t indicating anything more serious. Your doctor will run various tests on your stool like a fecal occult blood test to determine the cause. Most of the time, changes in stool color can be explained by treatable conditions, or simply by dietary causes. It’s unlikely that a change in your stool color is cause for a trip to the emergency room, or even for any panic. Always check for recent changes in your diet or side effects of medications if your stool color changes suddenly. Regardless of the cause, if you are concerned about your stool or changes in your digestion, your safest and most effective method of treatment should be to seek advice from your doctor. A doctor will be able to identify for certain if there is anything to worry about, or if what you’re dealing with is normal. Even if it might feel embarrassing or make you feel anxious to talk about your bowel movements, it’s important to bring them up with your doctor if you are concerned. It’s always better to play it safe and get a medical opinion. If the change in color is associated with abdominal pain or sudden diarrhea, for example, it could be a sign of something more than just a dietary change. If your stool color change is associated with any other sudden symptoms, see your doctor. Black or red diarrhea, for example, could be a sign of a serious condition and should be addressed immediately.