 [ Symptoms ] a fever from 100 to 102 9 that ibuphen will not keep down below 100 the fever has been for 5 days how dangerous is this 46 year old male no smoking or drinking came over me on a sunday and it has been steady from 102 9 to 100 depending on the ibuphen how long is it considered dangerous to have a steady fever [ Disease ] yes i think anytime you have a fever for a couple of days you should see a doctor the body is fighting something when there is a fever you need to find out what it is fighting