What is a fever for an adult?

I am trying to learn more about tracking health. I understand 100.4 F is a fever for adults, but is it different if we measure it under the arm versus in the mouth? What is the most reliable way?

Look, anything 100.4 F or above is a fever for an adult. Don't keep taking random pills to suppress it, just rest, drink water, and see a doctor if it doesn't go away in two days.

Bado ke liye 100.4 F se upar tapman ho toh bukhar mana jata hai. Aap acche se aaram kariye, khoob sara paani pijiye aur agar do din me thik na ho toh doctor babu ko zaroor dikha lijiye.

Hey, don't stress too much! For us adults, 100.4 F is considered a fever. Just take a warm cup of soup, get some solid sleep, and call a doc if it doesn't settle down.

I was just reading about this online. For adults, 100.4 F or higher is a fever, but a high fever is generally over 103 F. It's always best to consult a doctor if you feel very unwell or if it lasts long.