Most fevers pass in two to three days with rest, fluids, and acetaminophen or ibuprofen for comfort.
MedlinePlus's adult thresholds: call a doctor at 105F (40.6C) unless it drops readily, at a fever holding or rising past 103F (39.4C), at any fever past 48 to 72 hours, or at fevers recurring for a week-plus - plus fever with a chronic condition, weakened immunity, new rash or bruises, pain peeing, or recent travel. Emergency signs: confusion, severe headache, stiff neck, breathing trouble, blue lips, or seizure. Babies under 3 months with 100.4F (38C) or higher need same-day care. Pymander is a free AI doctor, 24/7 by text, and can help you read the number, the days, and the company it keeps.
What to do
Common questions
Should I see a doctor for a fever?
A fever is your immune system working, and most settle on their own within two or three days - fluids, rest, and acetaminophen or ibuprofen for comfort are usually the whole prescription. MedlinePlus draws the adult line precisely: call a doctor for a fever of 105F (40.6C) or higher unless it drops readily with treatment, a fever holding or climbing past 103F (39.4C), any fever lasting longer than 48 to 72 hours, or fevers that come and go for a week or more. Fever plus a serious chronic condition (heart disease, diabetes, COPD), a weakened immune system, a new rash or bruises, pain when peeing, or recent travel abroad also earns the call. The emergency list: a fever with confusion, a very bad headache, a stiff neck, difficulty breathing, blue lips, or a seizure. Babies run by stricter rules: any fever of 100.4F (38C) or higher in an infant under 3 months is a same-day medical problem - their immune systems cannot be trusted to handle it alone. For everyone else, the pattern that matters is simple: the number, the days, and the company the fever keeps. Pymander is a free AI doctor, 24/7 by text, that can help you read all three.