Steatorrhea, also known as steatorrhea, refers to diarrhea caused by the body’s poor digestion and absorption of ingested fat. Steatorrhea is usually characterized by an increase in the frequency of diarrhea, an increase in the volume of feces, a large amount of fat is excreted through the stool, the feces are smelly, grayish-white, and contain fat, and the patient often suffers from abdominal pain and bloating, and poor mental health. The symptoms of steatorrhea are usually due to a variety of causes of small intestinal dysabsorption, as well as a lack of certain components, a condition known as small intestinal malabsorption syndrome. The elimination of large amounts of fat from the stool can also be called small intestinal fat malabsorption syndrome. Inflammatory lesions of the small intestine, small intestinal fat absorption dysfunction, and gastrinomas can cause steatorrhea. Lipodystrophy is usually caused by dysfunction of lipid metabolism in the small intestine and therefore requires treatment with digestive enzyme supplements, and gastrinomas also require surgical treatment for relief. In addition, liver and gallbladder diseases as well as certain endocrine disorders can also cause steatorrhea, and patients with steatorrhea need to consult with their doctors and take medication as prescribed.