Yellow diarrhea can be caused by several factors, including dietary changes, food colors, and certain medical conditions. Yellow diarrhea occurs when stool passes too quickly through the intestinal tract, and the body is unable to absorb the fat in the stool properly, leading to fat malabsorption. Some of the common causes of yellow diarrhea include:

• Dietary factors: Eating foods high in food coloring, carrots, sweet potatoes, certain gluten products, or a diet high in fats can cause yellow diarrhea.

• Infections: Bacterial infections like giardiasis can cause bright yellow diarrhea. Intestinal infections can also cause inflammation in the intestinal lining, which can impede the absorption of water, fat, and other nutrients, leading to yellow diarrhea.

• Medical conditions: Medical conditions like celiac disease, pancreatitis, pancreatic cancer, a blockage in the pancreatic duct, or cystic fibrosis can cause yellow diarrhea. Reduced production of bile salts can also cause pale yellow or gray stool, which can signify a problem with the liver or gallbladder.

If yellow diarrhea is accompanied by other symptoms like a fever, vomiting, abdominal pain, pus-filled stool, inability to urinate, trouble breathing, fainting, lack of awareness, confusion, or mental changes, it is best to contact a doctor immediately. A person should also see a doctor if the color change continues for several days or other symptoms are present.