How do you get a fever in under 5 minutes?

It's not healthy or advisable to intentionally induce a fever, as it can be a sign of infection or illness. However, in some cases, a rapid increase in body temperature can be achieved by engaging in intense physical activity, consuming hot beverages, or using external heat sources like warm baths or heating pads. Always prioritize your health and consult a medical professional if you have concerns about fever or illness.