Autism or autism spectrum disorder causes a person to establish repetitive behavioral patterns and often impairs their social interactions with other people.

Doctors typically diagnose autism spectrum disorder (ASD) in childhood when symptoms can occur before 3 years of age, according to the American Autism Association.

In the United States, the Centers for Disease Control and Prevention (CDC) suggest that 1 in 59 children has ASD.

The term “spectrum” refers to the wide variety of symptoms and severities within ASD. Some people with the condition experience debilitating social problems while others may be able to function more independently.

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Autistic children may become distressed over breaks in their routine.

ASD is an umbrella term that accounts for a number of neurodevelopmental conditions.

In the newest edition of the American Psychiatric Association’s guidelines for diagnosis, known as the Diagnostic and Statistical Manual of Mental Disorders (DSM-V), they have added the following disorders to the category of ASD:

  • Asperger syndrome
  • childhood disintegrative disorder
  • pervasive developmental disorders not otherwise specified

While different types of ASD occur, common experiences among people with the condition include impairment in social situations and the adoption of repetitive behaviors.

Some autistic children might seem to show symptoms from birth, while others may develop more obvious signs as they become older.

Autism also has links to other medical conditions, such as epilepsy and tuberous sclerosis complex. According to the National Institute of Neurological Disorders and Stroke (NINDS), an estimated 20–30% of autistic people develop epilepsy by the time they reach childhood.

ASD may have a number of effects on a person’s social interaction and communication, including:

  • adoption of unusual speech patterns, such as using a robot-like tone
  • avoiding eye contact with others
  • not babbling or cooing to parents as an infant
  • not responding to their name
  • late development of speech skills
  • having difficulty with maintaining conversation
  • frequently repeating phrases
  • apparent difficulty in understanding feelings and expressing their own

As well as impaired communication, an autistic person may also display repetitive or unusual behaviors.

Examples of these include:

  • becoming so invested in a topic that it seems to consume them, such as cars, train timetables, or planes
  • becoming preoccupied with objects, such as a toy or household object
  • engaging in repetitive motions, such as rocking side to side
  • lining up or arranging toys or objects in very orderly ways

An autistic person might also experience balance or motor issues.

Around 1 in 10 autistic people exhibit signs of savant syndrome, although this condition might also occur in people with other developmental conditions or nervous system injuries.

Savant syndrome occurs when a person demonstrates extraordinary abilities in a particular field, such as playing a musical instrument, calculating extremely complex sums at high speed, reading two pages of a book simultaneously, or being able to memorize vast amounts of knowledge.

Autistic people thrive on routine and the ability to predict the outcomes of certain behaviors and places. A break in routine or exposure to loud, overstimulating environments can overwhelm an autistic person, leading to outbursts of anger, frustration, distress, or sadness.

No specific test can diagnose autism. Instead, doctors reach a diagnosis through parental reports of behavior, observation, and by ruling out other conditions.

For example, if a child has undiagnosed hearing loss, the symptoms can be similar to autism.

The causes of autism are currently not known, but significant numbers of studies are underway with a view to learning how it develops.

Researchers have identified several genes that appear to have connections to ASD. Sometimes, these genes arise by spontaneously mutate. In other cases, people may inherit them.

In studies of twins, autism often has a strong correlation between twins. For example, if one twin has autism, the other is likely to have autism an estimated 36–95% of the time, according to the NINDS.

Autistic people may also undergo changes in key areas of their brains that impact their speech and behavior. Environmental factors might also play a role in the development of ASD, although doctors have not yet confirmed a link.

However, researchers do know that some rumored causes, such as parenting practices, do not cause autism.

Do vaccines cause autism?

Another common misconception surrounding autism is that receiving vaccines, such as those for measles, mumps, and rubella (MMR), can contribute to autism.

However, the CDC report that there is no known connection between vaccines and autism.

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There is no link between vaccines and autism.

A 2013 study confirmed that the number of antigens, or substances that trigger the production of disease-fighting antibodies are the same in children who do and do not have ASD.

Some people claim that thimerosal, a preservative that contains mercury and is in specific vaccines, has links to autism. However, at least nine different studies since 2003 have provided evidence that counters this claim.

The Lancet journal published the initial paper that triggered the controversy around vaccines and autism and retracted it 12 years later after evidence of data tampering, and research fraud became clear. Governing bodies stripped the author, Andrew Wakefield, of his credentials and permission to practice.

There is no uniform treatment for autism, as every person with the condition presents differently.

Therapies and strategies are available for managing the health issues that often accompany autism. These issues can include epilepsy, depression, obsessive-compulsive disorder (OCD), and sleep disturbances.

Although not all of these treatments will be effective for all autistic people, there are many options to consider that may help people cope. Autism specialists or psychologists can refer a person for a treatment that reflects their presentation of autism.


Among the treatment interventions that may be beneficial are:

Applied Behavior Analysis (ABA): In ABA, an instructor will first try to learn about the particular behaviors of the autistic person. They will also want to know about the effects of their environment on this behavior, and how the person learns. ABA aims to increase desirable behaviors and reduce harmful or isolating ones by using positive reinforcement.

ABA can help improve communication, memory, focus, and academic performance. By analyzing current behaviors and teaching new actions step-by-step, an instructor can provide both an autistic person and the people around them with tools for support.

Early Start Denver Model (ESDM): This type of behavioral therapy occurs during play and helps children between the ages of 1 and 4 years old.

A psychologist, behavioral specialist, or occupational therapist will use joint activities and play to help an autistic child build positive relationships with a sense of fun. Parents and caregivers can then continue the therapy at home.

ESDM supports communication skills and cognitive abilities.

Floortime: This involves parents joining children in the play area and building relationships. ABA therapies might also use floortime to support treatment and vice versa. Parents let the children lead the game, allowing the child’s strengths to develop.

Through this engagement, an autistic child will learn two-way and complex communication, emotional thought, and intimacy. They also learn to take the lead of regulating themselves and engaging with their environment.

Occupational therapy (OT): This helps an autistic person develop the skills for everyday living and learn independence.

These skills include dressing without assistance, basic grooming and hygiene, and fine motor skills. Autistic people can then practice these skills outside of the therapy sessions, which are usually 30–60 minutes long.

Pivotal response treatment (PRT): This therapy aims to support motivation and the ability to respond to motivational cues in autistic children. It is a play-based therapy that focuses on natural reinforcement.

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Many therapies for autism revolve around helping caregivers and teachers provide support.

For example, if a child wants a toy car and asks for it in an appropriate way, they get the toy car, not an unrelated reward, such as candy. This also encourages autistic children to start social interactions, instead of just responding to them.

Relationship development intervention (RDI): This treatment centers on the importance of dynamic thinking, or the ability to adapt thoughts and process situations flexibly, to help improve quality of life in autistic people.

The focus of RDI includes understanding other people’s perspectives, processing change, and absorbing information from several sources at once, such as sight and sound, without experiencing distress.

Speech therapy: This helps address the challenges in communication that autistic people might experience.

Assistance might include matching emotions with facial expressions, learning how to interpret body language, and responding to questions. A speech therapist might also try to teach the nuances of vocal tone and help the individual strengthen their speech and clarity.

TEACCH: This program helps integrate the needs of autistic children into a classroom environment, with an emphasis on visual learning and support for the attention and communication difficulties that might arise.

Special education providers and social workers, as well as medical professionals providing other treatments — such as psychologists and speech therapists — can use this system to support autistic children.

Verbal behavior therapy (VBT): This helps autistic children connect language and meaning. Practitioners of VBT focus not on words, but the reasons for using them.

If a doctor prescribes medicine for an autistic child or adult, they will usually be trying to address seizures, depression, or disturbed sleep.

Again, medications may or may not be right for an autistic individual on a case-by-case basis.

Click here for a helpful aid that can break down which options will be best for a particular set of symptoms.

Coping strategies and skills

Autistic children often develop a range of behaviors that help them process the isolating effects of the condition.

These behaviors are attempts by the child to protect themselves from stimuli that may overwhelm them and increase sensory input to enhance feeling. They may also enact these behaviors to bring some level or organization or logic to their everyday lives.

While not all coping strategies for autism are harmful, some can inhibit social interaction and lead to isolation and distress.

These behaviors include:

  • isolating themselves and avoiding contact with others
  • repetitive patterns while playing and relying on familiar occurrences during the day
  • talking to themselves, humming, or whistling
  • becoming highly attached to preferred objects
  • choosing to seek out or avoid certain experiences to an extreme extent

The important factor in managing potentially isolating behaviors is not to discourage these behaviors, but to add other coping strategies that can make a child’s journey through autism easier, such as:

  • seeking help
  • using language more openly
  • relaxing and taking breaks
  • making their needs clear
  • managing sensory input

The following are effective ways to achieve this:

  • understanding that speech processing may undergo delays and accounting for this when speaking to an autistic child
  • restricting noise, movement, and the presence of nearby objects to help a child concentrate when presenting information to them
  • helping a child structure activities by giving the order-based cues, such as “First, do this, then…” or “Get ready… get set … go!”
  • demonstrating appropriate adult socialization in front of the autistic child
  • clearly defining a play space by using visual markers, such as beanbags, to promote a feeling of safety around other children
  • making sure information about events is both clear and visible, in terms of routine activities and those that fall outside of routine and may cause distress
  • running through and practicing these coping strategies during play

Different people experience ASD to varying extents and with a range of behaviors. However, these strategies and skills can help increase the tools available to each person with the condition and improve their quality of life.

There is no cure for autism. However, researchers are studying nearly every aspect of the condition, from its causes to potential treatments.

In some autistic people, medications and behavioral health interventions can improve the effects of the condition to enable a person to function independently in adulthood.

For others, the symptoms and co-existing conditions, such as epilepsy, may require further management and assistance.

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Research is helping to identify possible causes of and treatments for autism.

Some of the most significant advancements in autism research include:

A 2017 study in Proceedings of the National Academy of Sciences of the United States of America examined 32 children who received intranasal oxytocin or a placebo as a treatment. The research found that children who took oxytocin demonstrated improved social functioning. The study leaders had previously found that low oxytocin levels had links with lower social performance.

Research at the 2018 American Society of Human Genetics conference identified 43 previously unknown genetic sequences associated with developmental delays, including autism.

The ongoing Deciphering Developmental Disorders study is currently looking at undiagnosed conditions in more than 12,000 people in the United Kingdom and the Republic of Ireland.

The study aims to try and understand these developmental disorders to help those children and adults who experience them plus scientists and clinicians.

A 2017 study in the journal Nature found that brain growth in autistic children has links to the severity of the condition. The researchers theorized that this knowledge may help doctors diagnose autism at earlier stages than ever before.

These studies are a few examples of ongoing efforts that may assist in the future diagnosis and treatment of ASD.

According to the American Autism Association, doctors diagnose a person with ASD every 11 minutes in the United States.

A combination of education about ASD and earlier recognition means that people can receive early assistance for the condition. Ideally, a person should receive treatments and therapies as early as possible to enhance their quality of life.

Autism or ASD is a complex neurodevelopmental condition that causes difficulties with social interaction and favors strict adherence to routines and predictable patterns.

There are different types and severities of ASD. Some autistic people can live independently, while others require more sustained care and support.

The causes are currently unknown, but researchers have identified several genes that may have links to the development of ASD. Vaccines do not cause autism.

Research is ongoing, and treatments that might improve quality of life for autistic people are underway. Current therapies include occupational therapy, speech therapy, and various forms of communication support.


As an adult, is it likely that I have undiagnosed autism? I demonstrate a lot of the symptoms.


Yes, sometimes people who have mild symptoms of autism are not diagnosed until adulthood.

Symptoms of autism can mimic symptoms of other disorders, such as attention deficit hyperactivity disorder or obsessive-compulsive disorder, causing confusion regarding an exact diagnosis.

Occasionally, doctors will diagnose an adult with autism after they have a child who is diagnosed with autism and the adult notices symptoms in themselves.

Answers represent the opinions of our medical experts. All content is strictly informational and should not be considered medical advice.