climacophobia: An excessive fear of stairs, of falling down the stairs, being hurt in a fall, or having an anxiety about heights.
Those who have phobias of heights emphasize that their visual space is important. They will not be able to go down a flight of stairs if they can see the open stairwell. They will be frightened looking out of a high window that stretches from floor to ceiling, but not if the window's bottom is at or covered to waist level or higher.
The heights-phobic person is no more or less anxious than anyone else until exposed to heights, but then he or she becomes over whelmingly uncomfortable and fearful, sometimes having symptoms associated with a panic attack; such as, palpitations, sweating, dizziness, and difficulty in breathing.

The fear of heights may also be associated with other related phobias; such as, bicycles, skiing, certain amusement rides, stairs, tall buildings, bridges, and freeways.
clinomania: An overwhelming desire to stay in bed; especially, on a rainy day.
clinophobia: An abnormal fear or strong dislike of going to bed or of beds in general.
Such phobics may have chronic insomnia, night terrors, sleepwalking experiences, or fear of bedwetting.
There are even those who associate beds with the fear that they may fall asleep and never wake up.
clithrophobia, cleithrophobia, cleisiophobia: A morbid fear of being enclosed in a very confined space.
Although this phobia is similar to claustrophobia, clithrophobia generally applies to a very small, self-defined space, whereas claustrophobia can also refer to the fear of being in a large room without an easy or visible way out.
closed space: See these words for definitions, claustromania, claustrophobia, cleistophobia, cleisiophobia, clithrophobia
clouds: nebulaphobia, nephophobia
clowns: coulrophobia
cnidophobia: An excessive fear of nettles, plant stings, or all kinds of insect stings; including those of bees, wasps, mosquitoes, and other bugs.
This excessive fear may apply to all flying things that are perceived to be threatening.
cocainomania: 1. A morbid craving for cocaine. 2. Insanity that comes with delusions accompanying excessive use of cocaine.
coimetrophobia, koimetrophobia: 1. Etymologically based on the Greek koimeterion, it may be the most common anxiety disorder in prison inmates and is known as, "sleeping-room, burial-place". 2. An excessive fear of cemeteries.
Those who fear cemeteries usually are also afraid of going to funerals, looking at tombstones or dead bodies, and just hearing about funerals. Some people will drive long distances out of their way to avoid going by a cemetery or they will walk on the other side of the street to avoid being close to one.
Good friend, for Jesus' sake forbear
To dig the dust enclosed here;
Blest be the man that spares these stones,
And curst be he that moves my bones.
-William Shakespeare
coitomania: An obsession for sex, especially by women.
coitophobia: An abnormal fear of sex.
cold, frost: See cheimaphobia, cryophobia, frigophobia, psychrophobia
colors: chromatophobia, erythromania, erythrophobia, melanophobia, porphyrophobia, xanthophobia
cometophobia: An excessive fear of comets, especially when they may come closer to earth or are predicted to come in the future.
complaints: See paramania
computermania: An excessive use of or a compulsion to spend an abnormal amount of time using a computer or even more than one computer.
A man should not strive to eliminate
his complexes, but to get into accord with them:
they are legitimately what directs
his conduct in the world.
-Sigmund Freud
computerphobia, compuphobia: An intense dislike or exaggerated fear of computers or any association with them. See cyberphobia for more details.

computers: Such words as computermania, computerphobia, cyberphobia, logizomechanophobia, netomania, technomania, technophobia
confined space: Includes claustromania, claustrophobia, cleistophobia, cleisiophobia, clithrophobia
constipation: coprastasophobia, coprostasophobia
contamination: molysomophobia, mysophobia, rhypophobia, rupophobia
contrectophobia: A fear of sexual abuse or of being touched or fondled sexually by someone.
The term is derived from the Latin word contrectare, which means "to handle" or "to take hold of".
Mental health problems do not affect
three or four out of every five persons,
but one out of one.
-William Menninger
contreltophobia: An intense fear of sexual abuse.