1Multiple epiphyseal dysplasia
There is a rare genetic disorder that affects bone growth called Multiple epiphyseal dysplasia. It causes short stature in adults, short arms and legs, joint pain, deformities in the hands, feet, and spine and early osteoarthritis.
Maladaptive daydreaming is a disorder which causes someone to daydream for hours on end, and create elaborate fantasies comparable to an entire novel or movie.
About 1 in 50 people can't visualize images in their head. It's called Aphantasia, and if you have it you can't even visualize things such as your own house or your best friend’s face.
4Delayed Sleep Phase Disorder
People who are prone to staying up past midnight and sleeping in till afternoon could possibly have a circadian rhythm dysfunction known as Delayed Sleep Phase Disorder.
There is a voice disorder called Puberphonia where a person continues to speak like an adolescent after puberty.
6Busy Life Syndrome
Busy Life Syndrome is a real disorder causing forgetfulness and lack of concentration in people who take in too much information daily.
7Night Eating Syndrome
Night Eating Syndrome is an eating disorder in which 25% or more of the day's calories are consumed after the evening meal, habitual waking in the night to eat, and the belief that one must eat in order to fall back to sleep.
There is a psychological disorder called “Boreout” (Boredom burnout syndrome), which is used to describe the boredom of office employees. It can lead to psychological illnesses such as depression as well as physical illnesses.
9Maple Syrup Urine Disease
There is a rare medical disorder in infants called “Maple Syrup Urine Disease,” where the child's urine smells of maple syrup or burnt sugar and it can be fatal.
A rare connective tissue disorder known as Ehlers-Danlos syndrome is characterized by hypermobile joints and a deficiency in collagen (connective tissue) that results in pain and repeated injury. It often takes an average of 10 to 20 years to receive a diagnosis of EDS -- many in their 40s.