It is possible that other symptoms can accompany a fever. Fevers can be associated with a rapid heartbeat, increased breathing rate, as well as flushing, sweating, or warm skin. Lack of appetite and a tired feeling can also accompany a fever. An important thing to think about is dehydration, which can become serious if not carefully monitored. This is why it is important that if a fever gets worse or lasts more than 3 days after starting Advil, that you consult your healthcare provider.