Small stomach pain can be caused by appendicitis, irritable bowel syndrome, cystitis and so on. But based on this symptom can not be easily judged, it is recommended to consult a doctor in time to identify the cause of the disease. 1. Appendicitis: appendicitis is mainly manifested as right lower abdominal pain, acute appendicitis can have metastatic right lower abdominal pain symptoms, accompanied by nausea, vomiting, fever, malaise and other discomforts. Chronic appendicitis is characterized by pain in the lower right abdomen, and acute attacks can be triggered by strenuous activities or poor diet. 2. Irritable Bowel Syndrome (IBS): a common gastrointestinal dysfunction disorder characterized by persistent or intermittent episodes of abdominal pain, abdominal distension, often accompanied by changes in bowel habits and stool abnormalities, but there is no organic pathology. 3. Cystitis: generally manifested as frequent urination, urinary urgency, dysuria, lower abdominal pain and other symptoms, there may also be fever, chills and other systemic symptoms. Lower abdominal pain may also be caused by other factors, women are mostly related to adnexal diseases. If the symptoms persist, it is recommended to consult a doctor as soon as possible to clarify the cause and give targeted treatment. If not diagnosed and treated in time, it may seriously threaten the patient’s health.