INTRODUCTION
Fear is one of the most basic human emotions. It is
programmed into the nervous system and works like
 an instinct. From the time we're infants, we are
equipped with the survival instincts necessary to
 respond with fear when we sense danger or feel
 unsafe.
Fear helps protect us. It makes us alert to danger and
prepares us to deal with it. Feeling afraid is very
natural and helpful in some situations. Fear can be
like a warning, a signal that cautions us to be careful.
 Like all emotions, fear can be mild, medium, or
 intense, depending on the situation and the person.
  A feeling of fear can be brief or it can last longer.
         HOW FEAR WORKS ?
When we sense danger, the brain reacts instantly,
sending signals that activate the nervous system.
This causes physical responses, such as a faster
heartbeat, rapid breathing, and an increase in blood
pressure. Blood pumps to muscle groups to prepare
the body for physical action (such as running or
fighting). Skin sweats to keep the body cool. Some
people might notice sensations in the stomach, head,
chest, legs, or hands. These physical sensations of
fear can be mild or strong.