Abnormal stools.Diarrhea or bulky, loose (or watery), pale, frothy, and foul-smelling stools often occur. The stools may contain a large amount of fat and may stick to the sides of the toilet bowl, making them hard to flush. Children and adults often have the same types of symptoms. But intestinal problems, such as constipation, are more likely to occur in children.
Weight loss. Adults and children may have unexplained weight loss despite having a normal appetite. Younger children may fail to gain weight and grow as expected. This is called failure to thrive.