Pain below the navel, the possible causes are acute appendicitis, ureteral stones, acute gastroenteritis, abdominal or intestinal tumors, intestinal obstruction, female patients may be ruptured fallopian tube pregnancy, ovarian cysts tip torsion and so on. 1. Acute appendicitis: lower abdominal pain is mostly an early symptom of appendicitis patients, with the development of the disease, there can be pressure and rebound pain in the right lower abdomen, the location of the pain is relatively limited. 2. Ureteral stones: when ureteral stones fall to the second or third ureteral stenosis, patients may have lower abdominal pain, and some of them are accompanied by nausea, vomiting and frequent urination and other symptoms. 3. Acute gastroenteritis: patients mostly have lower abdominal pain, mostly paroxysmal pain, sometimes light and sometimes heavy, accompanied by nausea and vomiting, diarrhea and so on. 4. Abdominal or intestinal tumor: with the gradual increase of abdominal or intestinal tumors, patients may have abdominal pain, which may be accompanied by symptoms such as lethargy and fatigue. 5. Intestinal obstruction: patients often have lower abdominal pain, accompanied by abdominal distension, nausea, vomiting, stop defecation and gas evacuation and other symptoms. 6. Tubal pregnancy rupture: the pain is located in the lower abdomen, the pain is more intense, there is a risk of hemorrhage and hemorrhagic shock, need to consult a doctor in time for surgical treatment. 7. Ovarian cyst tip torsion: most of the cysts rupture after activities, the pain is aggravated, accompanied by intra-abdominal hemorrhage, need to seek medical treatment and surgery. The causes of lower abdominal pain are many, so it is necessary to consult a doctor in time, provide a complete history to the doctor, and improve the blood routine, urine routine, abdominal and pelvic ultrasound and CT and other examinations, so as to clarify the cause of the disease in time, and to treat the cause of the disease.