What does appendicitis mean?
Appendicitis is the inflammation of the appendix, a narrow, finger-shaped pouch projecting from the first part of the large intestine. It is one of the most common causes of sudden abdominal pain requiring surgery. The condition typically begins with vague discomfort around the navel, followed by nausea and pain that migrates to the lower right side of the abdomen, where it becomes sharp and localised. If untreated, the inflamed appendix can burst, spreading infection through the abdominal cavity — a serious complication known as peritonitis. Standard treatment is an operation called an appendectomy, sometimes supported by antibiotics. Because the symptoms overlap with other digestive complaints, doctors speak of 'suspected' or 'acute' appendicitis when making a diagnosis. The word entered English in the nineteenth century as surgeons learned to identify and treat the condition, and today it is firmly established both in medical language and in everyday speech, where it serves as shorthand for a sudden, painful, and time-sensitive medical emergency.
nounA medical condition in which the appendix, a small pouch attached to the large intestine, becomes inflamed and swollen, typically causing severe abdominal pain and requiring urgent treatment.
- Inflammation of the vermiform appendix, usually caused by obstruction, presenting as abdominal pain that classically shifts to the lower right side and often requiring surgical removal of the appendix.
"She was rushed to hospital with acute appendicitis and underwent emergency surgery that night."
"He woke at midnight with a dull ache near his navel that by morning had settled into sharp pain in the lower right abdomen — classic signs of appendicitis."
"The surgeon noted in her report that the patient had presented with perforated appendicitis, complicating what is normally a routine operation."
An inflamed appendix can rupture within a day or two of symptoms starting, which is why appendicitis remains one of the most common reasons for emergency abdominal surgery worldwide.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of appendicitis
The word appendicitis was formed in the nineteenth century from Latin roots: 'appendix', meaning an attachment or appendage, from the Latin verb 'appendere' (to hang upon), combined with the Greek-derived suffix '-itis', used in medicine to denote inflammation. It belongs to the large family of '-itis' terms such as tonsillitis and bronchitis that clinicians coined to name inflammatory diseases. Related words sharing the same Latin root include 'appendage', 'appendectomy' (the surgical removal of the appendix), and 'appendicular'.
How appendicitis is actually used
Strictly a clinical term used in medical contexts, though widely understood by the general public because the condition is so common. The adjective 'acute' is frequently attached to indicate sudden onset. Plural forms are not used for the condition itself.
Easily confused with appendicitis
The appendix is the anatomical organ itself, while appendicitis is the inflammation of that organ.
Gastroenteritis is inflammation of the stomach and intestines causing vomiting and diarrhoea, whereas appendicitis is inflammation of the appendix with pain typically localising to the lower right abdomen.