Fear

terrorapprehensionfearsscarescareddreadFearfulirrational fearafraidFearfulness
Fear is a feeling induced by perceived danger or threat that occurs in certain types of organisms, which causes a change in metabolic and organ functions and ultimately a change in behavior, such as fleeing, hiding, or freezing from perceived traumatic events.wikipedia
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Angst

dreadteenage angstteen angst
This hypothesized set includes such emotions as acute stress reaction, anger, angst, anxiety, fright, horror, joy, panic, and sadness.
Angst means fear or anxiety (anguish is its Latinate equivalent, and anxious, anxiety are of similar origin).

Panic

desperationalarmintense levels
This hypothesized set includes such emotions as acute stress reaction, anger, angst, anxiety, fright, horror, joy, panic, and sadness.
Panic is a sudden sensation of fear, which is so strong as to dominate or prevent reason and logical thinking, replacing it with overwhelming feelings of anxiety and frantic agitation consistent with an animalistic fight-or-flight reaction.

Emotion

emotionsemotionalemotional state
Fear is a feeling induced by perceived danger or threat that occurs in certain types of organisms, which causes a change in metabolic and organ functions and ultimately a change in behavior, such as fleeing, hiding, or freezing from perceived traumatic events.
His research findings led him to classify six emotions as basic: anger, disgust, fear, happiness, sadness and surprise.

Goose bumps

piloerectiongoose pimplesgooseflesh
An inborn response for coping with danger, it works by accelerating the breathing rate (hyperventilation), heart rate, vasoconstriction of the peripheral blood vessels leading to blushing and sanskadania of the central vessels (pooling), increasing muscle tension including the muscles attached to each hair follicle to contract and causing "goose bumps", or more clinically, piloerection (making a cold person warmer or a frightened animal look more impressive), sweating, increased blood glucose (hyperglycemia), increased serum calcium, increase in white blood cells called neutrophilic leukocytes, alertness leading to sleep disturbance and "butterflies in the stomach" (dyspepsia).
Goose bumps are the bumps on a person's skin at the base of body hairs which may involuntarily develop when a person is tickled, cold or experiencing strong emotions such as fear, euphoria or sexual arousal.

Acrophobia

fear of heightsacrophobicafraid of heights
For example, if a child falls into a well and struggles to get out, he or she may develop a fear of wells, heights (acrophobia), enclosed spaces (claustrophobia), or water (aquaphobia). His top ten list of fears published 2008 consisted of flying, heights, clowns, intimacy, death, rejection, people, snakes, failure, and driving. According to surveys, some of the most common fears are of demons and ghosts, the existence of evil powers, cockroaches, spiders, snakes, heights, Trypophobia, water, enclosed spaces, tunnels, bridges, needles, social rejection, failure, examinations, and public speaking.
Acrophobia is an extreme or irrational fear or phobia of heights, especially when one is not particularly high up.

Sadness

sadsaddenedSorrow
This hypothesized set includes such emotions as acute stress reaction, anger, angst, anxiety, fright, horror, joy, panic, and sadness.
Sadness is one of the "six basic emotions" described by Paul Ekman, along with happiness, anger, surprise, fear, and disgust.

Fear of flying

aviophobiaaerophobiaafraid of flying
His top ten list of fears published 2008 consisted of flying, heights, clowns, intimacy, death, rejection, people, snakes, failure, and driving.
Fear of flying is a fear of being on an aeroplane, or other flying vehicle, such as a helicopter, while in flight.

Evil

malevolentbadwicked
According to surveys, some of the most common fears are of demons and ghosts, the existence of evil powers, cockroaches, spiders, snakes, heights, Trypophobia, water, enclosed spaces, tunnels, bridges, needles, social rejection, failure, examinations, and public speaking.
Elements that are commonly associated with personal forms of evil involve unbalanced behavior involving anger, revenge, fear, hatred, psychological trauma, expediency, selfishness, ignorance, destruction or neglect.

Robert Plutchik

Psychologists such as John B. Watson, Robert Plutchik, and Paul Ekman have suggested that there is only a small set of basic or innate emotions and that fear is one of them.
He considered there to be eight primary emotions—anger, fear, sadness, disgust, surprise, anticipation, trust, and joy.

Ophidiophobia

fear of snakessnakesafraid of snakes
His top ten list of fears published 2008 consisted of flying, heights, clowns, intimacy, death, rejection, people, snakes, failure, and driving.
Ophidiophobia, or ophiophobia, is a particular type of specific phobia, the abnormal fear of snakes.

Anxiety

anxiousnervousnessanxieties
This hypothesized set includes such emotions as acute stress reaction, anger, angst, anxiety, fright, horror, joy, panic, and sadness.
Anxiety is not the same as fear, which is a response to a real or perceived immediate threat; anxiety involves the expectation of future threat.

Claustrophobia

claustrophobicfear of tunnelssmall spaces
For example, if a child falls into a well and struggles to get out, he or she may develop a fear of wells, heights (acrophobia), enclosed spaces (claustrophobia), or water (aquaphobia). According to surveys, some of the most common fears are of demons and ghosts, the existence of evil powers, cockroaches, spiders, snakes, heights, Trypophobia, water, enclosed spaces, tunnels, bridges, needles, social rejection, failure, examinations, and public speaking.
The amygdala is needed for the conditioning of fear, or the creation of a fight-or-flight response.

Display rules

Display rules affect how likely people are to show the facial expression of fear and other emotions.

Terrorism

terroristterroriststerrorist attack
The top ten fears were, in order: terrorist attacks, spiders, death, failure, war, criminal or gang violence, being alone, the future, and nuclear war.

Arachnophobia

arachnophobicarachnophobefear of spiders
The top ten fears were, in order: terrorist attacks, spiders, death, failure, war, criminal or gang violence, being alone, the future, and nuclear war.
In some extreme cases, even a picture or a realistic drawing of a spider can trigger intense fear.

Panic disorder

panicpanic disorderspanic disorde
MRI and fMRI scans have shown that the amygdalae in individuals diagnosed with such disorders including bipolar or panic disorder are larger and wired for a higher level of fear.
Panic attacks are sudden periods of intense fear that may include palpitations, sweating, shaking, shortness of breath, numbness, or a feeling that something terrible is going to happen.

Neuroplasticity

plasticityneural plasticitybrain plasticity
After a situation which incites fear occurs, the amygdalae and hippocampus record the event through synaptic plasticity.
His results suggest that long-term or short-term practice of meditation results in different levels of activity in brain regions associated with such qualities as attention, anxiety, depression, fear, anger, and the ability of the body to heal itself.

Face perception

facial recognitionface recognitionfaces
Androstadienone is known to influence activity of the fusiform gyrus which is relevant for face recognition.
Five-month-olds, when presented with an image of a person making a fearful expression and a person making a happy expression, pay the same amount of attention to and exhibit similar event-related potentials (ERPs) for both.

Nuclear warfare

nuclear warnuclear attacknuclear
The top ten fears were, in order: terrorist attacks, spiders, death, failure, war, criminal or gang violence, being alone, the future, and nuclear war.

Cortisol

stress hormonestress hormoneshydrocortisone
Some of the hormones involved during the state of fight-or-flight include epinephrine, which regulates heart rate and metabolism as well as dilating blood vessels and air passages, norepinephrine increasing heart rate, blood flow to skeletal muscles and the release of glucose from energy stores, and cortisol which increases blood sugar, increases circulating neutrophilic leukocytes, calcium amongst other things.
Changed patterns of serum cortisol levels have been observed in connection with abnormal ACTH levels, mood disorders (such as major depressive disorder), anxiety disorders, psychological stress, and physiological stressors such as hypoglycemia, illness, fever, trauma, surgery, fear, pain, physical exertion, or temperature extremes.

Anxiety disorder

anxiety disordersanxietynervous disorder
Anxiety disorders are a group of mental disorders characterized by significant feelings of anxiety and fear.

Culture of fear

climate of fearfearrule by fear
Popularized by the American sociologist Barry Glassner, culture of fear (or climate of fear) is the concept that people may incite fear in the general public to achieve political or workplace goals through emotional bias.

Panic attack

panic attacksanxiety attackanxiety attacks
Panic attacks are sudden periods of intense fear that may include palpitations, sweating, shaking, shortness of breath, numbness, or a feeling that something bad is going to happen.

Nightmare

nightmaresnightmarishbad dreams
A nightmare, also called a bad dream, is an unpleasant dream that can cause a strong emotional response from the mind, typically fear but also despair, anxiety and great sadness.

Paranoia

paranoidparanoid ideationmonster
Paranoia is an instinct or thought process which is believed to be heavily influenced by anxiety or fear, often to the point of delusion and irrationality.