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The discoloration of stools is a very subjective matter and so it would be difficult to interpret over the internet. However, in the broadest sense, stools that are more or less orange in color could results from beta-carotene (a form of vitamin A) or intake of food containing beta carotene (carrots, sweet potatoes etc). One other possiblity is a liver problem.
However, in your description you mentioned something more important than the color and that is the oily substance. This strongly points towards a condition known as steatorrhea (fat in stools). This could be the result of malabsorption which in turn is caused by many diseases.
I would strongly recommend a stool analysis. If fat is found in your stools further investigation is necessary to establish a diagnosis of steatorrhea. A stool exam would also exclude other abnormalities if present.
Please check our steatorrhea page
for more info.
Dr. Tamer Fouad, MD
MB, BCh, MSc Internal Medicine.
Consultant of Hematology - Oncology.