Fever What is it? A rise in body temperature. consisting of 100.4 (38 C) or higher. Plan of Action: To treat a fever: Drink plenty of fluids to stay hydrated. Dress in lightweight clothing. Use a light blanket if you feel chilled, until the chills end. Take acetaminophen (Tylenol, others) or ibuprofen (Advil, Motrin IB, others). Follow the directions on the label. When to seek medical advice: Seek medical care if someone with a fever has any of the following signs and symptoms: Difficulty breathing Chest pain Severe headache Confusion or agitation Abdominal pain Repeated vomiting Dry mouth, decreased or dark urine, or refusal to drink fluids, which may indicate dehydration Skin rashes Difficulty swallowing fluids Pain with urination or pain in the back When to seek emergency care: Fever with no sweating Severe headache Seizures Stiff neck Confusion Repeated vomiting or diarrhea Irritability or significant discomfort Any worrisome, different or unusual symptoms