Editing Appendicitis (section)

===Differential diagnosis===
[[File:Enlarged gallbladder with gallstone and cholecystitis.jpg|thumb|[[Coronal plane|Coronal]] [[CT scan]] of a person initially suspected of having appendicitis because of right-sided pain. The CT shows in fact an enlarged [[cholecystitis|inflamed gallbladder]] that reaches the right lower part of the abdomen.]]
Children: [[Gastroenteritis]], [[mesenteric adenitis]], [[Meckel's diverticulum|Meckel's diverticulitis]], [[intussusception (medical disorder)|intussusception]], [[Henoch–Schönlein purpura]], lobar [[pneumonia]], [[urinary tract infection]] (abdominal pain in the absence of other symptoms can occur in children with UTI), new-onset [[Crohn's disease]] or [[ulcerative colitis]], [[pancreatitis]], and abdominal trauma from [[child abuse]]; [[distal intestinal obstruction syndrome]] in children with cystic fibrosis; [[typhlitis]] in children with leukemia.

Women: A pregnancy test is important for all women of childbearing age since an [[ectopic pregnancy]] can have signs and symptoms similar to those of appendicitis. Other obstetrical/ gynecological causes of similar abdominal pain in women include [[pelvic inflammatory disease]], [[ovarian torsion]], [[menarche]], dysmenorrhea, [[endometriosis]], and [[Mittelschmerz]] (the passing of an egg in the ovaries approximately two weeks before menstruation).<ref>{{cite web | title = Pelvic inflammatory disease (PID) Symptoms; Diseases and Conditions | publisher = Mayo Clinic | url = http://www.mayoclinic.org/diseases-conditions/pelvic-inflammatory-disease/basics/symptoms/con-20022341 | access-date = 2015-04-23 | url-status = live | archive-url = https://web.archive.org/web/20150507162533/http://www.mayoclinic.org/diseases-conditions/pelvic-inflammatory-disease/basics/symptoms/con-20022341 | archive-date = 2015-05-07 }}</ref>

Men: [[testicular torsion]]

Adults: new-onset [[Crohn disease]], [[ulcerative colitis]], regional enteritis, [[cholecystitis]], [[renal colic]], perforated [[peptic ulcer]], [[pancreatitis]], [[rectus sheath hematoma]] and [[epiploic appendagitis]].

Elderly: [[diverticulitis]], intestinal obstruction, [[colon cancer|colonic carcinoma]], [[mesenteric ischemia]], leaking [[aortic aneurysm]].

The term "{{visible anchor|pseudoappendicitis}}" is used to describe a condition mimicking appendicitis.<ref name="pmid20633930">{{cite journal | vauthors = Cunha BA, Pherez FM, Durie N | title = Swine influenza (H1N1) and acute appendicitis | journal = Heart & Lung | volume = 39 | issue = 6 | pages = 544–546 | date = July 2010 | pmid = 20633930 | doi = 10.1016/j.hrtlng.2010.04.004 }}</ref> It can be associated with ''[[Yersinia enterocolitica]]''.<ref name="pmid18575909">{{cite book |title=Yersinia enterocolitica infection in diarrheal patients |journal=Eur. J. Clin. Microbiol. Infect. Dis. |volume=27 |issue=8 |pages=741–752 |date=August 2008 |isbn=978-0-9600805-6-4 |pmid=18575909 |doi=10.1007/s10096-008-0562-y |vauthors=Zheng H, Sun Y, Lin S, Mao Z, Jiang B |s2cid=23127869 }}</ref>