Diarrhea, press the lower right side of the navel small pain may be physiological reasons, but also may be acute gastroenteritis, acute appendicitis and other diseases, should be timely consultation to identify the cause. 1. Physiological factors: if the intake of too cold, stimulating diet, such as ice cola, ice cream, etc., as well as eating too fast, too full, or a short period of time after meals, exercise or a long time lying down and many other factors may cause abdominal distension, diarrhea, and may lead to a small pain in the lower right side of the navel. 2. Pathologic factors: (1) acute gastroenteritis: mainly caused by bacterial, viral, parasitic infections, or other factors caused by acute inflammatory changes in the gastrointestinal tract, the patient’s main manifestation of acute onset of abdominal pain, diarrhea, pressure will be a small pain in the lower right side of the navel. (2) acute appendicitis: this is the most common disease, the location of the appendix is not fixed, but the most common location is in the lower right side of the navel, but usually accompanied by abdominal distension and diarrhea, nausea and vomiting. In addition to the above factors, it cannot be ruled out that it is caused by other factors. It is recommended that if physiological causes are ruled out, you should consult a doctor to clarify the cause and give targeted treatment.