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==Differential diagnosis==
The most frequent reasons for abdominal pain are [[gastroenteritis]] (13%), [[irritable bowel syndrome]] (8%), urinary tract problems (5%), [[gastritis|inflammation of the stomach]] (5%) and [[constipation]] (5%).<!-- <ref name=Vin2014/> --> In about 30% of cases, the cause is not determined.<!-- <ref name=Vin2014/> --> About 10% of cases have a more serious cause including gallbladder ([[gallstone]]s or [[biliary dyskinesia]]) or [[pancreas]] problems (4%), [[diverticulitis]] (3%), [[appendicitis]] (2%) and [[cancer]] (1%).<ref name=Vin2014>{{cite journal|last1=Viniol|first1=A|last2=Keunecke|first2=C|last3=Biroga |first3=T|last4=Stadje|first4=R|last5=Dornieden|first5=K|last6=Bösner|first6=S|last7=Donner-Banzhoff|first7=N|last8=Haasenritter|first8=J|last9=Becker|first9=A|title=Studies of the symptom abdominal pain--a systematic review and meta-analysis.|journal=Family Practice|date=October 2014|volume=31|issue=5|pages=517–29|pmid=24987023|doi=10.1093/fampra/cmu036}}</ref> More common in those who are older, [[mesenteric ischemia]] and [[abdominal aortic aneurysm]]s are other serious causes.<ref name=":0">{{cite journal|last1=Spangler|first1=R|last2=Van Pham|first2=T|last3=Khoujah |first3=D|last4=Martinez|first4=JP|title=Abdominal emergencies in the geriatric patient |journal=International Journal of Emergency Medicine|date=2014|volume=7|pages=43|pmid=25635203 |doi=10.1186/s12245-014-0043-2 |pmc=4306086}}</ref>
 
===Acute abdominal pain===
[[Acute abdomen]] can be defined as severe, persistent abdominal pain of sudden onset that is likely to require [[surgery|surgical intervention]] to treat its cause. The pain may frequently be associated with [[nausea]] and [[vomiting]], [[abdominal distention]], [[fever]] and signs of [[Shock (circulatory)|shock]]. One of the most common conditions associated with acute abdominal pain is acute appendicitis.
 
====Selected causes====
 
* Traumatic: [[Blunt trauma|blunt]] or perforating [[physical trauma|trauma]] to the [[stomach]], [[bowel]], [[spleen]], [[liver]], or [[kidney]]
* Inflammatory:
** Infections such as [[appendicitis]], [[cholecystitis]], [[pancreatitis]], [[pyelonephritis]], [[pelvic inflammatory disease]], [[hepatitis]], [[mesenteric adenitis]], or a subdiaphragmatic [[abscess]]
** [[Gastrointestinal perforation|Perforation]] of a [[peptic ulcer]], a [[diverticulitis|diverticulum]], or the [[caecum]]
** Complications of [[inflammatory bowel disease]] such as [[Crohn's disease]] or [[ulcerative colitis]]
* Mechanical:
** [[Small bowel]] [[bowel obstruction|obstruction]] secondary to adhesions caused by previous surgeries, [[intussusception (medical disorder)|intussusception]], [[hernia]]s, benign or malignant [[neoplasia|neoplasm]]s
** [[Large bowel]] [[bowel obstruction|obstruction]] caused by [[colorectal cancer]], [[inflammatory bowel disease]], [[volvulus]], [[fecal impaction]] or [[hernia]]
* Vascular: occlusive [[ischemic colitis|intestinal ischemia]], usually caused by [[thromboembolism]] of the [[superior mesenteric artery]]
 
===By system===
* Idiopathic
** [[irritable bowel syndrome]] (affecting up to 20% of the population, IBS is the most common cause of recurrent, intermittent abdominal pain)
 
===Acute abdominal pain===
[[Acute abdomen]] can be defined as severe, persistent abdominal pain of sudden onset that is likely to require [[surgery|surgical intervention]] to treat its cause. The pain may frequently be associated with [[nausea]] and [[vomiting]], [[abdominal distention]], [[fever]] and signs of [[Shock (circulatory)|shock]]. One of the most common conditions associated with acute abdominal pain is acute appendicitis.
 
====Selected causes====
 
* Traumatic: [[Blunt trauma|blunt]] or perforating [[physical trauma|trauma]] to the [[stomach]], [[bowel]], [[spleen]], [[liver]], or [[kidney]]
* Inflammatory:
** Infections such as [[appendicitis]], [[cholecystitis]], [[pancreatitis]], [[pyelonephritis]], [[pelvic inflammatory disease]], [[hepatitis]], [[mesenteric adenitis]], or a subdiaphragmatic [[abscess]]
** [[Gastrointestinal perforation|Perforation]] of a [[peptic ulcer]], a [[diverticulitis|diverticulum]], or the [[caecum]]
** Complications of [[inflammatory bowel disease]] such as [[Crohn's disease]] or [[ulcerative colitis]]
* Mechanical:
** [[Small bowel]] [[bowel obstruction|obstruction]] secondary to adhesions caused by previous surgeries, [[intussusception (medical disorder)|intussusception]], [[hernia]]s, benign or malignant [[neoplasia|neoplasm]]s
** [[Large bowel]] [[bowel obstruction|obstruction]] caused by [[colorectal cancer]], [[inflammatory bowel disease]], [[volvulus]], [[fecal impaction]] or [[hernia]]
* Vascular: occlusive [[ischemic colitis|intestinal ischemia]], usually caused by [[thromboembolism]] of the [[superior mesenteric artery]]
 
=== By location ===