Fear is a very unpleasant sensation and a very primary emotion that arises in the animal or person naturally, spontaneously, before the minimum perception of danger or harm.
There is a physical mechanism that unleashes fear and it is found in our brain, in the reptilian. Meanwhile, the brain amygdala controls emotions and their location. When it perceives fear, it produces a response that can be to flee, paralyze or face it. In the same way, fear produces immediate physical manifestations, such as: an increase in blood pressure, an increase in blood glucose, the heart pumps more intensely and enlarges the eyes, among others.
Being a primary emotion, it can be said that fear is part of the adaptive scheme of humans and animals, since it represents a survival and defense mechanism. Thanks to fear, a person can respond quickly to an adverse situation.
All human beings at some point in their lives have felt fear and this is a painful emotion, a common instinct, that takes place when a certain event that you want to avoid is about to occur.
In the same way, the fact that we have all felt fear at some point also means that many of the situations or decisions before us we avoid and do not jump into making them simply out of fear of the consequences they may bring.
As the fear of God is called, in the Bible, the reverential fear and respect that, according to doctrines such as Christianity and Judaism, must be kept in God. Furthermore, the fear of God is one of the gifts of the Holy Spirit that moves us to practice good and turn away from the path of evil. In this sense, there are two types of fear: filial and servile. Filial fear is that according to which sin is repudiated because one knows that it is an offense against God, while servile fear is that according to which sin is avoided for fear of the punishment that it entails. The fear of God implies the fear that mortals must have of the Creator, Almighty and Supreme Judge, aware of their ability to punish and destroy the disobedient.
Fear can also mutate into a form of entertainment. This is the case of horror stories or films of the same genre, which generate fear but can be enjoyed since they do not represent a specific danger.