Fever is present when the person faces gastroenteritis. The organism might have different reactions to the infection. By raising the body temperature, the organism tries to fight the disease effectively. An alarming situation is when the temperature is as high as 102 degrees Fahrenheit or lasts for more than four days. Then, it is time to speak to your healthcare professional ASAP. Along with a fever, it is also possible to face such signs as chills. It is the outcome of rapidly changing temperature.