When is a fever serious? A simple guide

A fever is usually a sign your body is fighting an infection — not something to panic about. But a few warning signs change the picture.

Usually self-care

A mild fever with normal energy, drinking fluids, and no red-flag signs can often be managed at home with rest and fluids.

See a doctor soon

A fever lasting more than three days, a very high temperature, or a fever with a worsening cough or pain is worth a doctor's look.

Seek urgent care

A stiff neck, confusion, trouble breathing, a rash that doesn't fade under pressure, or a fever in a very young infant — these need urgent attention now.