 [ 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 ] these numbers are not alarming and normal variability in dates according to age you can try checking s ferritin for being assured it is ok healthy diet with vitamin d calcium and b1 6 and b12 is important let him practice a sport of any type swimming cycling etc…