Malabsorption with gastrointestinal bleeding: This could be due to conditions like celiac disease, where malabsorption leads to steatorrhea (fatty stools) and gastrointestinal bleeding from ulcers or inflammation can cause blood in the stool.

Inflammatory bowel disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause both blood and oil in the stool due to inflammation and malabsorption.
Gastrointestinal infection: Certain infections can lead to malabsorption and bleeding, resulting in oily and bloody stools.
Pancreatic insufficiency: Conditions affecting the pancreas, such as pancreatitis or pancreatic cancer, can lead to malabsorption of fats, resulting in oily stools, and bleeding from the pancreas or surrounding tissues.

Intestinal lymphoma: A type of cancer that can cause malabsorption and bleeding, presenting with oily and bloody stools. It's crucial to diagnose early due to its potential for severe outcomes if left untreated.
Mesenteric ischemia: Reduced blood flow to the intestines can cause ischemia, leading to bloody stools and potentially malabsorption if the condition affects a significant portion of the intestine.
Gastrointestinal angiodysplasia: Vascular malformations in the gastrointestinal tract can cause bleeding, and if associated with malabsorptive conditions, could present with oily stools as well.

Whipple's disease: A rare, systemic bacterial infection that can cause malabsorption, leading to oily stools, and gastrointestinal bleeding.
Abetalipoproteinemia: A rare inherited disorder affecting fat absorption, leading to very oily stools, and potentially gastrointestinal bleeding due to associated conditions like vitamin deficiencies.
Short bowel syndrome: A condition where a significant portion of the small intestine is missing or not functioning, leading to malabsorption and potentially both oily and bloody stools due to the reduced absorptive surface area and complications like bacterial overgrowth.