What does it mean if the stool is red but not blood?

Red stool that is not blood is usually caused by food or medication.

1. Food causes

Red stool that is not blood may result from consuming large amounts of foods high in red pigments, such as dragon fruit, red amaranth, and mulberries, which can stain the stool. This is a normal physiological phenomenon and generally does not cause discomfort. Once the diet returns to normal and the red pigments are fully metabolized, stool color typically returns to normal.

2. Medication causes

Red stool that is not blood may also occur in patients taking anticoagulant medications such as dicoumarol or warfarin. Symptoms usually gradually improve after reducing the dosage or discontinuing the medication.

In most cases of red stool not caused by blood, no special treatment is required. Maintaining a light, easily digestible diet and moderately increasing fluid intake to promote the metabolism of food pigments or drug components can help resolve the symptom. However, if the discoloration persists after dietary adjustments or stopping the medication, prompt medical evaluation—including stool tests, colonoscopy, and other examinations—is recommended to determine the underlying cause and condition.