<s>[INST] gud mrning sir, my sisters son had high fever 2  dys back and he got convulsion due to that,and he was taken to the doctor and the fever was subsided and he was ok now.the problem is we cant recognise the fever and he will get fever suddenly.why and whether antthing is serious.but he is very active now. [/INST] HI, thanks for using healthcare had a febrile seizure. This is a seizure that occurs along with a fever. It occurs most commonly in child Chat Doctor. Febrile seizures can be simple or complex. If it was simple febrile seizure then the risk of future seizures is very low. You can use a thermometer to help diagnose the presence of any fever. You should be able to obtain one of these from your local pharmacy. I hope this helps </s>