According to Child and Adolescent Mental Health, approximately 5 percent of children suffer from specific phobias and 15 percent seek treatment for anxiety-related problems. In recent years the number of children with clinically diagnosed phobias has gradually increased. Researchers are finding that the majority of these diagnoses come anxiety related phobias or society phobias.

Specific phobias are more prevalent in girls than in boys. Likewise, specific phobias are also more prevalent in older children than younger.

Though some fears are inborn, the majority are learned. Phobias develop through negative experiences and through observation. One way children begin to develop fears is by witnessing or hearing about dangers. Ollendick proposes while some phobias may originate from a single traumatizing experience, others may be caused by simpler, or less dramatic, origins such as observing another child’s phobic reaction or through the exposure to media that introduces phobias.

- 2% of parents linked their child’s phobia to a [direct conditioning episode]

- 26% of parents linked their child’s phobia to a [vicarious conditioning episodes]

- 56% of parents linked their child’s phobia to their child’s very first contact with water

- 16% of parents could not directly link their child’s phobia

In addition to asking about the origins of a child’s fear, the questionnaire asked if parents believed that “information associated with adverse consequences was the most influential factor in the development of their child’s phobia.” The results were as followed:

- 0% of parents though it was the most influential factor

- 14% of parents though it was somewhat influential

- 86% of parents though it had little to no influence

Bruce and Sanderson also state that animal phobias are more common in females than males. Furthermore, Dr. B.K. Wiederhold, a psychiatrist investigating virtual reality therapy as a possible method of therapy for anxiety disorders, goes on to provide data that although prevalent in both men and women, 75% to 90% of patients reporting specific phobias of the animal subtype are women.

Negative experiences with horses during one's childhood may give rise to this phobia. Equinophobia may also be triggered by a fall from a horse. In many cases, people begin to avoid horses and this gradually develops from fear to a full-blown phobia.

The phobia can also be caused by a simple fear of the animal itself. A horse's imposing size and weight and large teeth may scare some people, especially children.

Negative media portrayals of horses and stallions may add to one's fears.

Anxiety around mirrors and at all costs staying away from mirrors

Phobias are a common form of anxiety disorders and distributions are heterogeneous by age and gender. An American study by the National Institute of Mental Health (NIMH) found that between 8.7 percent and 18.1 percent of Americans suffer from phobias, making it the most common mental illness among women in all age groups and the second most common illness among men older than 25. Between 4 percent and 10 percent of all children experience specific phobias during their lives, and social phobias occur in one percent to three percent of children and adolescents.

A Swedish study found that females have a higher incidence than males (26.5 percent for females and 12.4 percent for males). Among adults, 21.2 percent of women and 10.9 percent of men have a single specific phobia, while multiple phobias occur in 5.4 percent of females and 1.5 percent of males. Women are nearly four times as likely as men to have a fear of animals (12.1 percent in women and 3.3 percent in men) — a higher dimorphic than with all specific or generalized phobias or social phobias. Social phobias are more common in girls than in boys, while situational phobia occurs in 17.4 percent of women and 8.5 percent of men.

Jeanette M. Bruce and William C. Sanderson, in their book "Specific Phobias", concluded that the age of onset for animal phobias is usually early childhood, between the ages of five and nine. A study done in South Africa by Drs. Willem A. Hoffmann and Lourens H. Human further confirms this conclusion for patients suffering from cynophobia and additionally found dog phobia developing as late as age 20.

Of the simple phobias, aquaphobia is among the more common subtypes. In an article on anxiety disorders, Lindal and Stefansson suggest that aquaphobia may affect as many as 1.8% of the general Icelandic population, or roughly one in fifty people.

Though scopophobia is a solitary disorder, many individuals with scopophobia also commonly experience other anxiety disorders. Scopophobia has been related to many other irrational fears and phobias. Specific phobias and syndromes that are similar to scopophobia include erythrophobia, the fear of blushing (which is found especially in young people), and an epileptic's fear that being looked which may itself precipitate such an attack. Scopophobia is also commonly associated with schizophrenia and other psychiatric disorders. It is not considered indicative of other disorders, but is rather considered as a psychological problem that may be treated independently.

Sociologist Erving Goffman suggested that shying away from casual glances in the street remained one of the characteristic symptoms of psychosis in public. Many scopophobia patients develop habits of voyeurism or exhibitionism. Another related, yet very different syndrome, scopophilia, is the excessive enjoyment of looking at erotic items.

Specific phobias have a one-year prevalence of 8.7% in the USA with 21.9% of the cases being severe, 30.0% moderate and 48.1% mild. The usual age of onset is childhood to adolescence. Women are twice as likely to suffer from specific phobias as men.

Evolutionary psychology argues that infants or children develop specific phobias to things that could possibly harm them, so their phobias alert them to the danger.

The most common co-occurring disorder for children with a specific phobia is another anxiety disorder. Although comorbidity is frequent for children with specific phobias, it tends to be lower than for other anxiety disorders.

Onset is typically between 7 and 9 years of age. Specific phobias can occur at any age but seem to peak between 10 and 13 years of age.

The alternative view is that the dangers, such as from spiders, are overrated and not sufficient to influence evolution. Instead, inheriting phobias would have restrictive and debilitating effects upon survival, rather than being an aid. For some communities such as in Papua New Guinea, Cambodia and South America (except Chile, Colombia, Brazil, Uruguay, Argentina and Bolivia), spiders are included in traditional foods. This suggests arachnophobia may be a cultural, rather than genetic trait.

There are three major categories of driving phobia, distinguished by their onset.

The first and most common cause of a fear of driving is traffic accidents. These situations cause PTSD driving phobia, where the fear develops in response to a traumatic event. Usually, situations like these trigger a fear of driving in only specific situations related to the original cause, though it also can trigger a fear of driving entirely.

The second most common form is driving phobia as a specific phobia. Because driving does involve some danger and the possibility of a collision, there does exist some fear or caution in many rational people. However, for some the fear of crashing, losing control over the car, being criticized or being in a dangerous situation will cause panic. It is classified as a phobia when the anxiety does not rationally reflect the amount of danger.

The least common category is an extension of agoraphobia, the anxiety of having a panic attack while being in crowds or public places. One manifestation of agoraphobia is the inability to travel long distances away from home. When driving, an agoraphobe may feel that he is putting himself into a fearful situation, and driving phobia may develop.

Scopophobia is unique among phobias in that the fear of being looked at is considered both a social phobia and a specific phobia, because it is a specific occurrence which takes place in a social setting. Most phobias typically fall in either one category or the other but scopophobia can be placed in both. On the other hand, as with most phobias, scopophobia generally arises from a traumatic event in the person's life. With scopophobia, it is likely that the person was subjected to public ridicule as a child. Additionally, a person suffering from scopophobia may often be the subject to public staring, possibly due to a deformity or physical ailment.

According to the Social Phobia/Social Anxiety Association, U.S. government data for 2012 suggests that social anxiety affects over 7% of the population at any given time. Stretched over a lifetime, the percentage increases to 13%.

Sufferers of catoptrophobia can fear the breaking of a mirror bringing extreme bad luck. They can fear the thought of something frightening jumping out of the mirror or seeing something disturbing inside of it next to their own reflection when looking directly at it. Others fear that it is a link to the preternatural world or a gateway into another world. Some also fear their own reflection in the darkness, as it can appear distorted in strange ways. Some people may also fear being pulled into the mirror by some preternatural force.

Exposure therapy has been proven as an effective treatment for people who have a fear of bees. It is recommended that people place themselves in a comfortable open environment, such as a park or garden, and gradually over a prolonged period of time move closer to the bees. This process should not be rushed, it may take many months spent watching bees before people feel comfortable in their presence.

Apiphobia is one of the zoophobias prevalent in young children and may prevent them from taking part in any outdoor activities. Older people control the natural fear of bees more easily. However, some adults face hardships of controlling the fear of bees.

A recommended way of overcoming child's fear of bees is training to face fears (a common approach for treating specific phobias). Programs vary.

Fear of the dark is a common fear or phobia among children and, to a varying degree, adults.

The fear of flying may be created by various other phobias and fears:

- Fear of crashing, which in rare cases will cause death, is the most common reason for the fear of flying.

- Fear of closed in spaces (claustrophobia), such as that of an aircraft cabin

- Fear of heights (hypsophobia)

- Feeling of not being in control

- Fear of vomiting, where a person will be afraid that they'll have motion sickness on board, or encounter someone having motion sickness and have no control over it (such as escaping it)

- Fear of having panic attacks in certain places, where escape would be difficult and/or embarrassing (agoraphobia)

- Fear of hijacking or terrorism

The phobia manifests itself in different ways. For most people it is less about fear than about loathing, similar to the reaction many people have to snakes or rats. Some people experience it almost all the time, others just in response to direct stimuli. Some possible situations that can trigger the loathing of cats are: hearing purring, seeing a cat in real life, imagining the possibility of a cat touching or rubbing against one, the thought of meeting a cat in the dark, seeing the staring eyes of a cat (cats have the tendency to stare at passers-by) cats in pictures and on television, and cat-like toys and cat-like fur. Big cats such as lions or tigers can also trigger the stimuli associated with a phobia.

Aquaphobia or waterfright is a persistent and abnormal fear of water. Aquaphobia is a specific phobia that involves a level of fear that is beyond the patient's control or that may interfere with daily life. People suffer aquaphobia in many ways and may experience it even though they realize the water in an ocean, a river, or even a bathtub poses no imminent threat. They may avoid such activities as boating and swimming, or they may avoid swimming in the deep ocean despite having mastered basic swimming skills. This anxiety commonly extends to getting wet or splashed with water when it is unexpected, or being pushed or thrown into a body of water.

Autophobia can be derived from social anxiety. When people with this phobia are left alone, they will often experience panic attacks, which is a common reaction in those suffering from social anxiety. This disease can also stem from depression because when people become seriously autophobic, they start to find certain tasks and activities almost impossible to complete. This usually occurs when autophobes are faced with a possibility of going into a public place where there are lots of people or simply a place that is uncomfortable or unfamiliar to them. This phobia can also be closely related to agoraphobia, which leads to lowered self-confidence and uncertainty of their ability to finish certain activities that need to be done alone. People suffering from this phobia tend to imagine the worst possible scenario. For example, they might have a panic attack and then think that they are going to die from this event.

Another experience that doctors believe leads individuals to develop this phobia is children being abandoned, usually by their parents, when they are very young. This first causes childhood trauma that then persists to effect them as they grow up. This turns into autophobia because they are now afraid that all of the important people in their lives are going to leave or abandon them. Therefore, this particular phobia can come from behavior and experiences that these people have had when they were growing up. However, abandonment does not necessarily mean being left alone physically, this also includes being isolated financially or emotionally. Having drastic, life-altering experiences, particularly causes more trauma which makes this phobia worse. People that have very high anxiety and in this case are more “high strung,” are more susceptible to this phobia.

Although this phobia is often developed at a young age, it can develop later in life as well. Individuals sometimes develop this fear with the death of a loved one or the ending of an important relationship. Autophobia can also be described as the fear of being without a specific person. Tragic events in a person's life may create this fear of being without one specific person, but this often will eventually progress into a fear of being secluded in general.

Fear of the dark is usually not a fear of darkness itself, but a fear of possible or imagined dangers concealed by darkness. Some degree of fear of the dark is natural, especially as a phase of child development. Most observers report that fear of the dark seldom appears before the age of 2 years. When fear of the dark reaches a degree that is severe enough to be considered pathological, it is sometimes called scotophobia (from σκότος – "darkness"), or lygophobia (from λυγή – "twilight").

Some researchers, beginning with Sigmund Freud, consider the fear of the dark to be a manifestation of separation anxiety disorder.

An alternate theory was posited in the 1960s, when scientists conducted experiments in a search for molecules responsible for memory. In one experiment, rats, normally nocturnal animals, were conditioned to fear the dark and a substance called "scotophobin" was supposedly extracted from the rats' brains; this substance was claimed to be responsible for remembering this fear. These findings were subsequently debunked.

Like astraphobia, lilapsophobia is a common fear for children, although less common. Because children are just learning to distinguish between fantasy and reality, major storm broadcasts on television or discussion by parents can cause fear that the storm is coming with a tornadic potential or a hurricane.

Because fear is a part of normal child development, this phobia is not diagnosed unless if persisted for more than six months. Parents should conquer the child's fear by telling them how rare the major storms that hit hometown area are.

Discriminatory aspects of ageism have been strongly linked to gerontophobia. This irrational fear or hatred of the elderly is associated with the fact that someday all young people will grow old and that old age is associated with death. This unwillingness to accept death manifests in feelings of hostility and discriminatory acts towards the elderly. This source is irrelevant as it too has aged out of the scope of sociological bearing >

Equinophobia or hippophobia is a psychological fear of horses. "Equinophobia" is derived from the Greek word φόβος ("phóbos"), meaning "fear" and the Latin word "equus", meaning "horse". The term "hippophobia" is also derived from the Greek word "phóbos" with the prefix derived from the Greek word for horse, ἵππος ("híppos").

An example of the phobia can be found in Freud's psychoanalytic study of Little Hans.

Anticipatory anxiety of being out of control and overwhelmed can prevent a person from planning to travel by air. The thought of an upcoming flight can cause great distress, particularly when compelled to travel by air. The most extreme manifestations can include panic attacks or vomiting at the mere sight or mention of an aircraft or air travel.