My son,aged about 17 years, has been suffering from fever from past three days. It started with headache and leg pain and the legs and hands were cold before the onset of fever and one more thing is that it is increasing, as on day one it was 98.8, then 100.6, yesterday it was 100.4 and today it is 102.1… First day I gave crocin pain reliever,  and yesterday  I gave Dolo 650 every six hours, the fever is not decreasing, and today it 102.1 and he also has tiredness.  Can anyone tell me what might be the reason for this type of fever?   Thank you