To feel chills is having a sudden sensation that can be caused by different reasons. Whether due to the cold, emotions or a medical condition, the phenomenon has a relationship with the ancestors and is a positive reaction.
The human body tends to respond involuntarily to such a sensation when we are in a dangerous situation or feeling an intense emotion, such as fear or pleasure.
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Likewise, goosebumps connect to the survival situations of ancestors who faced extreme cold temperatures and needed to maintain their body temperature.
Science explains that when the body temperature drops below 37°C, muscles contract and relax to expend energy and heat the body.
“Shivering is our body's way of increasing its core temperature to bring it back to a state of homeostasis,” explains Emily Shore, on the McGill University blog in Canada.
Thus, these tremors are an automatic movement of the body, such as breathing and heart rate.
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It is common for many animals to shiver as a form of protection against threats. In these cases, the sympathetic nervous system stimulates the organism to be ready for escape or defense.
In a way, the raised hair makes the animal appear larger and the adrenaline spike demonstrates that it is possible to face attack situations.
However, goosebumps are also linked to spirituality or a moment of intense emotion, because of the dopamine released in the brain.
So, even if it's not a matter of survival, the body also feels goosebumps when we watch a horror movie, listen to a song or are with someone we love.
Called psychogenic chills, they are related to the feeling of well-being that represents a positive emotion in the brain. Thus, the body prepares itself for the increase in blood pressure, sweating and, of course, the chills.
* With information from the blog McGill University.
