A dramatic drop in the human body’s core temperature of 98.6 degrees Fahrenheit prevents the heart and brain from working properly (via Live Science). According to Outside Magazine, every one-degree drop below 95 degrees leads to mental confusion and amnesia. It also becomes harder to move as the muscles get cold pretty quickly due to the lack of body fat in humans (per Ranker).

By the time the body reaches 88 degrees, the kidneys are working overtime due to the increased blood flow to the organs. Kidney failure can occur, but not before the urge to urinate and the eventual loss of bladder control. At 86 degrees, the brain is starting to become even more confused, and the lack of oxygen will trigger both visual and auditory hallucinations. Then, something strange happens at 85 degrees — the body feels uncontrollably hot, and victims of hypothermia begin to take off their clothes. This weird phenomenon is known as paradoxical undressing. Scientists believe that the dilation of constricted blood vessels against the skin causes the body to feel extremely hot. In many cases, this is the beginning of the end. By 82 degrees, loss of consciousness occurs, and anything below 70 degrees means death is imminent as all organs start to fail and shut down.

Per the National Library of Medicine, even if a person receives medical treatment in extreme hypothermia, rewarming shock can occur. This is when a sudden drop in blood pressure can cause cardiac arrest and death. The lesson here is to bundle up and stay indoors when temperatures reach all-time lows. According to the New York Post, children and the elderly are at the most at risk for hypothermia due to their weak heart muscles.