A change in the color of the stool when the diet is normal must be taken seriously, and is likely to be caused by a disease. The more common causes may be the consumption of certain foods containing more red pigment or excessive secretion of fecal cholestrol, if these causes of red stools, usually there will not be any major problems. The most important thing is to distinguish between red stool or blood in the stool, if blood in the stool needs to be taken seriously, must go to a specialized hospital for routine stool examination or colonoscopy. Hemorrhoids, intestinal polyps and colon cancer can all cause blood in the stool, which is a more serious condition and requires specialized treatment. Do not be nervous after the appearance of red stools first, and make sure to seek early medical treatment.