I am having oral temperature which fluctuates like 98.2 in the morning which raises to 99/99.2/99.4 in the late afternoon and evening which again gets back to normal after 10/11 pm to 98.4 which gets 97.6 at about 4 am in morning. I have done full body checkup in a reputed hospital and nothing was found, widal test done a month before wgich shows 1:160 tire for both o and h antigen, and i have taken Ciprofloxacin 500 for6 days and cefuroxime 500 for 5 days but no improvement in temperature and it remains same. I donot have any weakness or feel anything, What can be the causes??