Feeling hot or overheated is related to how your body regulates temperature. A small area in your brain called the hypothalamus acts as your thermostat, maintaining a core body temperature of 98.6 degrees Fahrenheit (or 37 degrees Celsius).

Fever typically makes a person feel hot. However, environmental and lifestyle factors, medications, age, hormones, and certain emotional states can all raise body temperature without having a fever. Depending on the cause, a person who feels hot may sweat excessively or not sweat at all.

Feeling hot in heated environments, hot weather, or during exercise is normal, and sweating is an essential body response for keeping cool. If people are feeling hot all the time, or sweating more than usual, it could be a sign of an underlying issue.

A rise in body temperature, also known as a "hot flash," is often a sign that you have an anxiety disorder. Normally your body heat should only rise when you're in a dangerous or stressful situation, and not simply out of the blue when nothing appears to be happening.