Are there any types of thermometers you can alter the normal reading as they are people whose bodies are different from others?

Yes, the type of thermometer you’re using can alter what’s considered a normal reading: An oral reading of 100 degrees or higher may be considered a fever, as is an armpit reading of 99 degrees or higher.

It’s important to read the manual that comes with your specific thermometer, so you know how it’s calibrated. The manual should specify what’s considered a normal temperature versus a fever based on the device you’re using.