Hi doctor, I had fever, cough cold 5 days back. I started medicine and fever went down, cough mile decrease and cold is still there. I am worried for one thing. If I am measure my temp throughout day then it comes around 98.6 in morning and after noon but goes to 99.4 in evening and night. I am in bihar and it is very cold here. Does body temp increase in winter like this ?? I did 4 month complete blood test and it was normal'. Could this be something serious as life-threatening ?? Please guide.