When having fever, is it ok to take bath or it may be prohibited?

It's fine: Hot water while it can temporarily increase body temperature can sometimes help with fever because of the loss of heat through dilated blood vessels on the skin after bathing. If it feels good I think fine. I sometimes take a hot bath when I feel a slight cold coming on and I believe it sometimes helps to avoid becoming more ill..no evidence just personal experience. Avoid becoming light-headed.