Patients with insulinoma usually do not have unformed stools, but once the development of the disease involves the digestive system, or if the patient is accompanied by digestive disorders, unformed stools are very likely to occur. Insulinoma may cause hypoglycemia due to excessive insulin secretion, and common symptoms include sympathetic nervous excitement, impaired consciousness, temporal lobe epilepsy, and mental abnormality, etc., but it does not usually cause unformed stools. However, if insulinoma involves the digestive system, or if the patient is accompanied by digestive system diseases, such as peptic ulcer, Zoetzel’s syndrome, etc., it is very likely to cause the symptom of unformed stools. Since it is difficult to recognize insulinoma in the early stage and to detect it through examination, it is recommended that individuals who always experience unexplained low blood sugar and other uncomfortable symptoms should consult a doctor in a timely manner in order to avoid delaying their condition.