5. Fever
While there are many different causes of ulcerative colitis, one of the most common is infection. In other words, the lining has become infected by virus or bacteria and as a result, the body will begin trying to drive it out. It is therefore not actually the infection itself causing the symptoms, but rather the body’s own response to that infection as it attempts to drive out the invasion. This then leads to inflammation (hence the ulcerative colitis), as well as increased heart rate, and yes, fever.
Fever itself is not a bad thing. It is actually designed to create a less hospitable environment for the bacteria or virus in the body: driving them out by making the system too hot.
However, fever can nevertheless be dangerous if it is allowed to continue for too long at too great a temperature: this can eventually cause the body to become dehydrated, which can be very dangerous. This is even more of a problem when you consider that diarrhea can also cause dehydration. Make sure that you keep drinking large amounts of water, and that you monitor your temperature.