Fever is another typical symptom that indicated ulcerative colitis and can develop for many reasons, but in this case, it occurs as a reaction to the damage caused by the disease. By increasing its internal temperature, the body tries to kill bacteria that may be harming the body. Malaise, malnourishment, and nausea can also trigger a fever. Ulcerative colitis patients are also likely to experience chills, meaning a feeling of coldness that overwhelms the body. This occurs while body temperature fluctuates.