The World Health Organization defines Disability as follows: "Disabilities is an umbrella term, covering impairments, activity limitations, and participation restrictions. An impairment is a problem in body function or structure; an activity limitation is a difficulty encountered by an individual in executing a task or action; while a participation restriction is a problem experienced by an individual in involvement in life situations. Thus disability is a complex phenomenon, reflecting an interaction between features of a person’s body and features of the society in which he or she lives."[1]
An individual may also qualify as disabled if he/she has had an impairment in the past or is seen as disabled based on a personal or group standard or norm. Such impairments may include physical, sensory, and cognitive or developmental disabilities. Mental disorders (also known as psychiatric or psychosocial disability) and various types of chronic disease may also be considered qualifying disabilities.
A disability may occur during a person's lifetime or may be present from birth. A physical impairment is any disability which limits the physical function of limbs or fine or gross motor ability.
Here is a list of disabilities provided by Wikipedia that details out the ones that everyone cannot see:
* Learning and applying knowledge
* General tasks and demands
* Communication
* Mobility
* Self-care
* Domestic life
* Interpersonal interactions and relationships
* Major life areas
* Community, social and civic life
* Academic problem
* Acculturation problem
* Acute stress disorder
* Adjustment disorder
* Adolescent antisocial behavior
* Adult antisocial behavior
* Adverse effects of medication-not otherwise specified
* Age-related cognitive decline
* Agoraphobia
* Agoraphobia without history of panic disorder
* Alcohol-related disorder
* Amnestic disorder
* Amphetamine (or amphetamine-like)-related disorder
* Anorexia nervosa
* Antisocial personality disorder
* Anxiety disorder
* Anxiolytic-related disorder
* Asperger syndrome
* Attention-deficit/hyperactivity disorder
* Atypical autism
* Autistic disorder
* Autophagia
* Avoidant personality disorder
B
* Bereavement
* Bibliomania
* Binge eating disorder
* Bipolar disorder
* Body dysmorphic disorder
* Borderline intellectual functioning
* Borderline personality disorder
* Breathing-related sleep disorder
* Brief psychotic disorder
* Bulimia nervosa
* Caffeine-related disorder
* Cannabis-related disorder
* Catatonic disorder
* Catatonic Schizophrenia
* Childhood antisocial behavior
* Childhood Disintegrative Disorder
* Chronic motor or vocal tic disorder
* Circadian rhythm sleep disorder
* Clinical Depression
* Cocaine-related disorder
* Cognitive disorder
* Communication disorder
* Conduct disorder
* Conversion disorder
D
* Delirium
* Delusional disorder
* Dementia
* Dependent personality disorder
* Depersonalization disorder
* Depression
* Depressive disorder
* Derealization
* Developmental coordination disorder
* Disorder of written expression
* Disruptive behavior disorder
* Dissociative amnesia
* Dissociative disorder
* Dissociative identity disorder
* Down syndrome
* Dyspareunia
* Dyssomnia
* Dysthymic disorder
E
* Eating disorder-not otherwise specified
* Echolalia
* Echopraxia
* Emotional disorder
* Encopresis
* Enuresis (not due to a general medical condition)
* Erotomania
* Exhibitionism
* Expressive language disorder
F
* Factitious disorder
* Feeding disorder of infancy or early childhood
* Female and male orgasmic disorders
* Female sexual arousal disorder
* Fetishism
* Fregoli delusion
* Frotteurism
G
* Ganser syndrome
* Gender identity disorder
* Generalized anxiety disorder
* General adaptation syndrome
[edit] H
* Hallucinogen-related disorder
* Histrionic personality disorder
* Huntington's disease
* Hypoactive sexual desire disorder
* Hypomanic episode
I
* Impulse control disorder-not elsewhere classified
* Inhalant-related disorder
* Insomnia due to a general medical condition
* Intermittent explosive disorder
J
* Joubert syndrome
K
* Kleptomania
L
* Learning disorders
M
* Major depressive disorder
* Major depressive episode
* Male erectile disorder
* Malingering
* Manic episode
* Mathematics disorder
* Medication-related disorder
* Megalomania
* Melancholia
* Mental disorder-not otherwise specified due to a general medical condition
* Mental Retardation
* Mixed episode
* Mixed receptive-expressive language disorder
* Mood disorder
* Mood episode
* Motor skills disorder
* Munchausen's syndrome
* Munchausen's syndrome by proxy
N
* Narcissistic personality disorder
* Narcolepsy
* Necrophilia
* Neglect of child
* Neuroleptic-related disorder
* Nicotine-related disorder
* Nightmare disorder
O
* Obsessive-compulsive disorder (OCD)
* Obsessive-compulsive personality disorder (OCPD)
* Occupational problem
* Oneirophrenia
* Opioid-related disorder
* Oppositional defiant disorder (ODD)
P
* Pain disorder
* Panic attack
* Panic disorder with agoraphobia
* Panic disorder without agoraphobia
* Paranoid personality disorder
* Paraphilia
* Parasomnia
* Parent-child relational problem
* Partner relational problem
* Pathological gambling
* Pedophilia
* Perfectionism
* Personality change due to a general medical condition
* Personality disorder
* Pervasive developmental disorder (PDD)
* Phase of life problem
* Phencyclidine (or phencyclidine-like)-related disorder
* Phonological disorder
* Physical abuse
* Pica
* Polysubstance-related disorder
* Post-traumatic embitterment disorder (PTED)
* Posttraumatic stress disorder (PTSD)
* Premature ejaculation
* Primary hypersomnia
* Primary insomnia
* Psychological factor affecting medical condition
* Psychotic disorder
* Pyromania
R
* Reactive Attachment Disorder of infancy or early childhood
* Reading disorder
* Relational disorder
* Relational problem
* Religious or spiritual problem
* Residual schizophrenia
* Rett's disorder
* Rumination syndrome
S
* Schizoaffective disorder
* Schizoid personality disorder
* Schizophrenia
* Schizophreniform disorder
* Schizotypal personality disorder
* Sedative-, hypnotic-, or anxiolytic-related disorder
* Selective mutism
* Separation anxiety disorder
* Severe mental retardation
* Sexual abuse of adult
* Sexual abuse of child
* Sexual arousal disorder
* Sexual aversion disorder
* Sexual desire disorder
* Sexual disorder
* Sexual dysfunction
* Sexual pain disorder
* Sexual sadism
* Shared psychotic disorder
* Sibling relational problem
* Sleep disorder
* Sleep terror disorder
* Sleepwalking disorder
* Social phobia (Social anxiety disorder)
* Somatization disorder
* Somatoform disorder
* Specific phobia
* Stereotypic movement disorder
* Stuttering
* Substance-related disorder
T
* Tardive dyskinesia
* Tic disorder
* Tourette's disorder
* Transient tic disorder
* Transvestic Fetishism
* Trichotillomania
V
* Vaginismus
* Vascular dementia
* Voyeurism