About this temp fluctuation problem.

One of my friend having temp 98 and sometimes having 99.5-99.8 some fluctuations 97.8-99.8 earlier he is having thypoid during his thypoid also same temperature,after this also same temperature ,from april6th2018 onwards ,he visted so many doctors done blood tests such as thyroid normal,scrub thypus negative,CRP 6,ESR in April 30 in June esr is 10,blood culture in June negative,widal negative,smear mp negative,rh factor negative,us abdomen normal,chest x-ray clear,mantoux negative,urine normal,he is having fluctuations in between 98 -99.8,if he went outside and check temperature after 15min it is 99.4,after 1 hr it will be 99,doctors are saying that it is normal for you u don't want to worry that temp is normal for your body ,based on the people the temperature value will change ,is it correct now it almost 4mnths he is suffering can he go to hostel for studying