Is this bad or not?
My 5yr old sister has a fever of 102 is it harmful in any way?
That's pretty high , giveHer medicine & put aCold rag on her forehead .. If that doesn't work make her take a cold shower! If itGets to 104, take her to the hospital
yes,it an extreme fever can cause brain damage
take her to the hospital or doctors
go to the doctor urgent
Children can die fast from high fever. Be very careful.
give her something for her fever, if it doesn't go down, take her to emergency.