 [ Symptoms ] what temperature is considered a fever for cancer chemotherapy patients [ Disease ] if you have a temperature of 100 4ºf or higher for more than 1 hour or a one time temperature of 101ºf or higher this should be considered an emergency you should call your doctor right away even if it is in the middle of the night it is important for you to remember though that even if you do not have a fever but just are not feeling well you should call your doctor right away no matter the time of day www preventcancerinfections org is an excellent resource to learn more about the risk of getting an infection during your chemotherapy