In suspected appendicitis, which fever pattern is most concerning for perforation?

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Fever level helps differentiate simple inflammation from more advanced, potentially perforated disease. A high fever in suspected appendicitis is the most concerning sign because it reflects a systemic inflammatory response that often accompanies perforation with leakage of intestinal contents into the peritoneal cavity or a secondary intra-abdominal infection. In uncomplicated appendicitis, fever is usually low-grade or absent; a marked fever suggests progression to a more dangerous state, such as perforation or an alternative diagnosis like peritonitis. However, fever absence does not completely rule out perforation, especially in older adults or immunocompromised patients, where the fever response can be blunted. So, a high fever should prompt urgent reassessment, imaging, and surgical evaluation.