Go to the ER if a fever reaches 103F (39.4C) or more and will not come down, or if any fever arrives with trouble breathing, chest pain, stiff neck, severe headache, confusion, fainting, seizure, or a rash that does not blanch under pressure.
Those pairings can mean meningitis or sepsis, and minutes matter. Otherwise, most adult fevers - a high temperature is 38C (100.4F) or above - are the immune system working and respond to rest, fluids, and acetaminophen or ibuprofen. Urgent same-day care fits a fever that keeps worsening despite home treatment, lasts beyond three days, or follows foreign travel, surgery, or a new drug. Pregnancy, age over 65, chemo, or immune suppression all lower the bar for getting seen. Pymander is a free AI doctor, 24/7 by text, and can help you judge your specific fever right now.
What to do
Common questions
When should an adult go to the hospital for a fever?
Go to the emergency room if your fever hits 103F (39.4C) or higher and will not come down with medicine, or if any fever comes with trouble breathing, chest pain, a stiff neck, severe headache, confusion, fainting, a seizure, or a rash that does not fade when you press it. Those combinations can signal meningitis, sepsis, or other emergencies. For most adults, a fever is the immune system doing its job - a high temperature is usually 38C (100.4F) or above - and can be managed at home with rest, fluids, and acetaminophen or ibuprofen. Get urgent same-day care (not necessarily the ER) if the fever keeps climbing despite home treatment, lasts more than three days, or follows recent travel abroad, surgery, or a new medicine. Extra caution applies if you are pregnant, over 65, immunocompromised, or on chemotherapy: lower thresholds, earlier calls. Pymander is a free AI doctor, 24/7 by text, that can help you weigh your exact situation in the moment.