Trichotillomania disorder

People who suffer from it have an irresistible urge to pull out hair from their scalp, eyebrows or other areas of their body. Hair pulling from the scalp often leaves patchy bald spots, which people with trichotillomania may go to great lengths to disguise.

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Strange and curious illnesses

Ochoa (Urofacial) Syndrome

This obscure, inherited disorder presents at birth and causes infants to grimace when, in fact, they are attempting to smile. 

Trigger thumb

It's also known as trigger finger and it causes a person's finger or thumb to get caught in a locked position. According to the Mayo Clinic, it can then stay stuck or straighten with a painful "snap."

Jerusalem Syndrome

You're on a guided tour of Jerusalem, and your friend begins acting strangely. At first you think he's just jet-lagged and tired, but once he's wandering around in bed sheets and proclaiming himself John the Baptist, you know something's really wrong. Your friend has Jerusalem Syndrome.
 
           

Cotard's syndrome

Cotard's syndrome is also known as Cotard's delusion and walking corpse syndrome.
 A person who suffers from corpse syndrome denies his/her existence as a living person.

Carrots addiction

Eating raw carrots may be as addictive as cigarette smoking, and every bit as difficult to give up, according to research on people who develop serious cravings for the vegetable.

                                          

Water allergy

It's also known as "aquagenic urticaria" and it's extremely rare. Sufferers appear to be allergic to water. It usually occurs late in life and often as a consequence of a hormonal imbalance brought about by giving birth.

Paris Syndrome

 A dozen or so Japanese tourists a year have to be repatriated from the French capital after having suffered from the Paris Syndrome. That is what some polite Japanese tourists suffer when they discover that Parisians can be rude or the city does not meet their expectations. The experience can apparently be too stressful for some and they suffer a psychiatric breakdown.

Alice in Wonderland Syndrome

Alice in Wonderland Syndrome (AIWS) is a neurological disorder which disrupts the messages sent from the eyes to the brain, causing a corresponding distortion in visual perception. This condition can also cause strange distortions in the sense of touch and sound in the patient.

Blue Skin Disorder

Someone who suffers from it demonstrates a blue discoloration of the skin, especially, the fingernails and toenails.

Capgras Syndrome

Capgras Syndrome is named for its discoverer, the French psychiatrist Jean Marie Joseph Capgras. People who suffer from it have the ilusion of watching impostors rather than relatives or friends, when they are really these last ones. The patient may also see himself as his own double.

Maple syrup urine disease

Maple syrup urine disease is an inherited disorder in which the body is unable to process certain protein building blocks (amino acids) properly.

Foreign Accent Syndrome

It's not a very common disease in which people who have suffered strokes or other injuries adopt a new accent.