Abdominal pain is a very common clinical symptom. First of all, abdominal pain is divided into severe pain in the whole abdomen and hidden pain with more obvious localization. Severe pain in the whole abdomen, also known as acute abdomen, is characterized by severe pain in the whole abdomen, pressure pain, rebound pain, muscle tension in the abdominal wall, and even shock, which often implies extensive and severe disease. Patients should not be given pain medications or alcohol until they have been assisted and diagnosed by a physician to avoid aggravation and masking of symptoms. If there are no symptoms of peritoneal irritation such as pressure pain, rebound pain and muscle tension, but severe pain in the abdomen persists for more than an hour without relief, the patient should also be seen in the hospital. In addition to the above, occult pain in the abdomen is mostly caused by milder digestive disorders, but may also be associated with diseases of the thoracic organs, urinary tract and genital organs and can be self-diagnosed according to the location of the pain and other concomitant symptoms: Concomitant symptoms. Possible diagnosis Periumbilical pain or colic, sudden onset, paroxysmal increase Intestinal roundworms (see intestinal parasitosis). Pain in the upper abdomen or around the umbilicus, relieved by antacids, often accompanied by vomiting and diarrhea Acute gastroenteritis or gastric ulcer . Intermittent cramping pain in the lower abdomen Intestinal dysfunction. Chronic, periodic, rhythmic abdominal pain in the middle and upper abdomen, with pressure pain, closely related to diet. Peptic ulcer with persistent severe pain in the active phase of the disease. Pain radiating from the right subcostal area to the right shoulder Cholecystitis or diaphragmatic lesions. Drusen-like paroxysmal pain with vomiting, intermittent with no pain at all Biliary ascariasis. Persistent right upper abdominal pain and tenderness to percussion in the liver area with jaundice Viral hepatitis. Lower abdominal pain, burning pain during urination, frequent urination Cystitis or other urinary tract infection. The pain starts in the lower back and then moves or spreads to the groin Urinary tract disorders can be caused by this type of pain (e.g., urinary tract infection or kidney stones). Pain in the left lower abdomen with frequent bouts of diarrhea and intermittent constipation Colonic allergy, or ulcerative colitis. In men, lower abdominal pain, inguinal swelling discomfort hernia, central epigastric stabbing pain with spread to the left shoulder, angina pectoris.