yesterday was annual function of my child, till yesterday morning she was fine, she went to attend annual function and was fine, she had lunch at 2 O clock and after that she didn't eat anything till 9 O clock night, due to annual function, teachers didn't allowed me, when she came up she got sudden temperature rise, and at night 11 o'clock I gave paracetamol, now it's morning but the fever is still there, what could be the reason for suddenly rise in temperatures, it's 100 f