One symptom of progressing Crohn's disease is a fever. It is uncommon for a person to develop fevers early in the disease's development. Current theories believe that fevers develop as part of the inflammatory process. However, they may also be the result of certain Crohn's medications. For some people with Crohn's, the fever is a sign of impending complications. Abscesses, or collections of pus, can cause fevers. A toxic megacolon, one of the most life-threatening complications of Crohn's disease, may also contribute to fevers. This issue causes the large intestine to dilate and widen, increasing the intensity and frequency of many Crohn's disease symptoms.

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