What causes mental retardation? 13 possible conditions

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Overview of Mental Retardation

Mental retardation or intellectual disability, (MR/ID), exists in children whose brains do not develop properly or function within the normal range. There are four levels of retardation: mild, moderate, severe, and profound. Sometimes, MR/ID may be classified as other or unspecified. Mental retardation involves both a low IQ and problems adjusting to everyday life.

MR/ID can result in learning, speech, physical, and social disabilities. Severe cases are diagnosed at birth. However, milder forms might not be noticed until a child fails to meet a common developmental goal. Almost all cases of MR/ID are diagnosed by the time a child reaches 18 years of age.

Levels of Mental Retardation

MR/ID is divided into four levels based on IQ and degree of social adjustment.

Mild Mental Retardation

At this level, a person:

  • takes longer to learn to talk, but can communicate well once he or she knows how
  • fully independent in self-care
  • has problems with reading and writing
  • is socially immature
  • is unable to deal with responsibilities of marriage or parenting
  • may benefit from specialized education plans
  • has an IQ range of 50 to 69
  • may have associated conditions, including autism, epilepsy, or physical disability

Moderate Mental Retardation

At this level, a person:

  • is slow in understanding and using language
  • has only a limited ability to communicate
  • can learn basic reading, writing, counting skills
  • is a slow learner
  • is unable to live alone
  • can get around on own
  • can take part in simple social activities
  • has an IQ range of 35 to 49

Severe Mental Retardation

At this level, a person:

  • has noticeable motor impairment
  • has severe damage to and/or abnormal development of central nervous system
  • has an IQ range of 20 to 34

Profound Mental Retardation

At this level, a person:

  • is unable to understand or comply with requests or instructions
  • is immobile
  • must wear adult diapers
  • uses very basic nonverbal communication
  • cannot care for own needs
  • requires constant help and supervision
  • has an IQ of less than 20

Other Mental Retardation

Children in this category are often blind, deaf, mute, and physically disabled. These factors prevent physicians from conducting screening tests.

Unspecified Mental Retardation

Signs of MR/ID exist, but there is not enough information to assign the child to a level.

What Causes Mental Retardation?

According to Psychology Today, only 25 percent of MR/ID cases have a known cause (Psychology Today, 2010).

When they are known, the cayses of mental retardation include:

  • trauma before or during birth, such as oxygen loss, alcohol exposure, or infection
  • genetic abnormalities, such as inherited abnormal genes, Down syndrome, fragile X syndrome, and PKU (phenylketonuria)
  • lead or mercury poisoning
  • severe malnutrition or other dietary issues
  • early childhood sickness, such as whooping cough, measles, or meningitis

Symptoms of Mental Retardation

Symptoms of MR/ID will vary based on the level of the disability. They can include:

  • failure to meet intellectual standards
  • sitting, crawling, or walking later than other children
  • problems learning to talk or trouble speaking clearly
  • memory problems
  • inability to understand the consequences of actions
  • inability to think logically
  • childish behavior beyond a normal age
  • lack of curiosity
  • learning difficulties
  • IQ below 70
  • inability to lead a normal life because of the inability to communicate, take care of oneself, or interact with others

Individuals who are intellectually disabled will often have some of the following behavioral issues:

  • aggression
  • dependency
  • withdrawal from social activities
  • attention-seeking behavior
  • depression during adolescent and teen years
  • lack of impulse control
  • passivity
  • tendency toward self-injury
  • stubbornness
  • low self-esteem
  • low tolerance for frustration
  • psychotic disorders
  • attention difficulties

Physical signs of MR/ID include short stature and malformed facial features. However, physical signs are not always present.

How Is Mental Retardation Diagnosed?

A diagnosis of MR/ID requires that both intellectual and adaptive skills be well below average. There are three parts to the evaluation:

  • interviews with parents
  • observations of the child
  • standard tests

Your child will be given standard intelligence tests, such as the Stanford-Binet Intelligence Test, to determine IQ. Other tests, such as the Vineland Adaptive Behavior Scales, will be given to assess your child’s daily living skills and social abilities compared with other children in the same age group. It is important to remember that children from different cultures and socio-economic statuses may perform differently on these tests. Results of these tests will be combined with information obtained from interviews with parents and observations of the child to assist in the diagnosis.

The screening process might include visits to many different professionals including the following:

  • psychologist
  • speech pathologist
  • social worker
  • pediatric neurologist
  • developmental pediatrician
  • physical therapist

Laboratory and imaging tests may be performed as well to detect metabolic and genetic disorders and structural problems with the brain. It is important to rule out such things as hearing loss, learning disorders, neurological disorders, and emotional problems as the cause for delayed development before making a diagnosis of MR/ID.

Once MR/ID has been diagnosed, the family, school, and primary care physician will use the results of these tests and evaluations to develop a treatment and education plan.

Treatment Options for Mental Retardation

Ongoing counseling will often be needed to help the child cope with disabilities.

Parents with intellectually disabled infants and toddlers will get a family service plan that describes their child’s needs. The plan will also detail the services the child will need to help him or her with normal development. Family needs are also addressed in the plan.

When the child is ready to attend school, a new plan, called the Individualized Education Program (IEP), will be put in place to assist the child with his or her educational needs.

The main goal of treatment is to assist the child in reaching his or her full potential in terms of education and social and life skills. Treatment may include behavior therapy, occupational therapy, counseling, and in some cases, medication. All children with MR/ID benefit from special education, and the federal Individuals with Disabilities Act (IDEA) requires that public schools provide free and appropriate education to children with mental retardation and other developmental disabilities.

What Is the Long-Term Outlook?

When MR/ID occurs with other serious physical problems, the life expectancy of the child may be shortened. In general, the more severe the cognitive disability and the more physical problems the child has, the shorter the life expectancy. However, a child with mild to moderate MR/ID has a fairly normal life expectancy. As adults, these people can often be successful at jobs that require basic intellectual skills, can live independently, and can support themselves.

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See a list of possible causes in order from the most common to the least.

1

Cerebral Palsy

Cerebral palsy is a disorder of muscle movement and coordination caused by an injury to a child's brain that occurs before birth or during infancy. It affects the part of the brain that controls body movement. Othe...

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2

Ito Syndrome (Incontinentia Pigementi Achromians)

Ito syndrome (IS) is a rare condition characterized by loss of skin color on certain parts of the body. A serious abnormality associated with it is balding and missing or abnormally shaped teeth and nails.

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3

Down Syndrome

Down syndrome is a genetic abnormality that occurs due to an extra copy of chromosome 21. It causes lifelong developmental delays that can range from moderate to severe. It cannot be cured but can be managed wit...

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4

Aarskog Syndrome

Aarskog syndrome is a very rare genetic disorder caused by a mutation on your child's X-chromosome. This disorder can affect your child's stature, facial features, genitalia, muscles, and bones. It primarily affect...

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5

Muscular Dystrophies

Muscular dystrophies are a group of diseases that are passed down genetically. These diseases cause damage and weakness to muscles over time. This damage and weakness is caused by the lack of a protein calle...

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6

Tay-Sachs Disease

Tay-Sachs is a disease of the central nervous system; it is a neurodegenerative disorder. Tay-Sachs most commonly affects infants. In infants, it is a progressive disease that is unfortunately always fatal. Rarely...

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7

Hydrocephalus

Hydrocephalus is a condition that occurs when fluid builds up in the skull and causes the brain to swell. The name literally means "water on the brain." Brain damage can occur as a result of the fluid buildup. This ca...

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8

Aicardi Syndrome

Aicardi syndrome is a rare genetic disorder that interferes with the formation of the corpus collusum, the connector between two hemispheres of the brain. Medical researchers do not believe that the disorder is passe...

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9

Acrodysostosis

Genetic changes that occur while the fetus is growing can cause disorders that are present at birth. These are sometimes referred to as "congenital disorders." Acrodysostosis is one such condition, albeit a rare one...

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10

Phenylketonuria

Phenylketonuria is a rare genetic condition in which the body is unable to breakdown phenylalanine, an essential amino acid.

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11

Basal Cell Nevus Syndrome

Basal cell nevus syndrome is a group of defects caused by a rare genetic condition. It affects the skin, endocrine system, nervous system, eyes, and bones. Other names for basal cell nevus syndrome include: Gorli...

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12

Huntington's Disease

Huntington's disease is a hereditary condition in which your brain's nerve cells gradually break down. This affects your physical movements, emotions, and cognitive abilities. There is no cure, but there are ways t...

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13

Lead Poisoning

Lead poisoning is a serious and sometimes fatal condition. It occurs when lead builds up in the body. Lead is a highly toxic metal and a very strong poison. It is found in lead-based paints, including paint on the wall...

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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