Autism spectrum disorder (ASD) is a condition that affects social interaction, communication, interests and behaviour.

In children with ASD, the symptoms are present before three years of age, although a diagnosis can sometimes be made after the age of three.

It's estimated that about 1 in every 100 people in the UK has ASD. More boys are diagnosed with the condition than girls.

There's no "cure" for ASD, but speech and language therapy, occupational therapy, educational support, plus a number of other interventions are available to help children and parents.

Read about help and support available for people with ASD.

Signs and symptoms

People with ASD tend to have problems with social interaction and communication.

In early infancy, some children with ASD don’t babble or use other vocal sounds. Older children have problems using non-verbal behaviours to interact with others – for example, they have difficulty with eye contact, facial expressions, body language and gestures. They may give no or brief eye contact and ignore familiar or unfamiliar people.

Children with ASD may also lack awareness of and interest in other children. They’ll often either gravitate to older or younger children, rather than interacting with children of the same age. They tend to play alone.

They can find it hard to understand other people's emotions and feelings, and have difficulty starting conversations or taking part in them properly. Language development may be delayed, and a child with ASD won’t compensate their lack of language or delayed language skills by using gestures (body language) or facial expressions.

Children with ASD will tend to repeat words or phrases spoken by others (either immediately or later) without formulating their own language, or in parallel to developing their language skills. Some children don’t demonstrate imaginative or pretend play, while others will continually repeat the same pretend play.

Some children with ASD like to stick to the same routine and little changes may trigger tantrums. Some children may flap their hand or twist or flick their fingers when they’re excited or upset. Others may engage in repetitive activity, such as turning light switches on and off, opening and closing doors, or lining things up.

Children and young people with ASD frequently experience a range of cognitive (thinking), learning, emotional and behavioural problems. For example, they may also have attention deficit hyperactivity disorder (ADHD), anxiety, or depression.

About 70% of children with ASD have a non-verbal IQ below 70. Of these, 50% have a non-verbal IQ below 50. Overall, up to 50% of people with "severe learning difficulties" have an ASD.

Read more about the symptoms of ASD.

Getting a diagnosis

The main features of ASD – problems with social communication and interaction – can often be recognised during early childhood.

Some features of ASD may not become noticeable until a change of situation, such as when the child starts nursery or school.

See your GP or health visitor if you notice any of the signs and symptoms of ASD in your child, or if you're concerned about your child's development. It can also be helpful to discuss your concerns with your child's nursery or school.

Read more about diagnosing ASD.

Caring for someone with ASD

Being a carer isn't an easy role. When you're busy responding to the needs of others, it can affect your emotional and physical energy, and make it easy to forget your own health and mental wellbeing.

If you're caring for someone else, it's important to look after yourself and get as much help as possible. It's in your best interests and those of the person you care for.

Read more about being a carer, including information on:

You can also call the Carers UK Wales helpline on 0808 808 7777.

What causes ASD?

The exact cause of ASD is unknown, but it's thought that several complex genetic and environmental factors are involved.

In the past, some people believed the MMR vaccine caused ASD, but this has been investigated extensively in a number of major studies around the world, involving millions of children, and researchers have found no evidence of a link between MMR and ASD.

Read more about the causes of ASD.

Autism in adults

Some people with ASD had features of the condition as a child, but enter adulthood without ever being diagnosed.

However, getting a diagnosis as an adult can often help a person with ASD and their families understand the condition, and work out what type of advice and support they need.

For example, a number of autism-specific services are available that provide adults with ASD with the help and support they need to live independently and find a job that matches their skills and abilities.

Read more about adults with ASD.

Since 2008, the Welsh Government has delivered an all-age All-Wales Autistic Spectrum Disorder Action Plan. This action plan has led to each local authority in Wales identifying an ASD lead for their area. Each local authority has a local ASD stakeholder group and also a local ASD Action Plan. Obviously personnel may change from time to time so for contacts with the local ASD lead for your area please contact your local authority or even charities in Wales such as Autism Cymru or the National Autistic Society. Additionally, the Welsh Government website holds over a dozen autism awareness-raising materials for families and also for a range of health, education, social care, social justice, housing and practitioner groups.


The main features of autism spectrum disorder (ASD) are problems with social communication and interaction.

See your GP or health visitor if you notice any of the following signs of ASD in your child or if you’re concerned about your child’s development.

Signs of ASD in pre-school children:

Spoken language

  • delayed speech development (for example, speaking less than 50 different words by the age of two), or not speaking at all
  • frequent repetition of set words and phrases
  • speech that sounds very monotonous or flat
  • preferring to communicate using single words, despite being able to speak in sentences

Responding to others

  • not responding to their name being called, despite having normal hearing
  • rejecting cuddles initiated by a parent or carer (although they may initiate cuddles themselves)
  • reacting unusually negatively when asked to do something by someone else

Interacting with others

  • not being aware of other people’s personal space, or being unusually intolerant of people entering their own personal space
  • little interest in interacting with other people, including children of a similar age
  • not enjoying situations that most children of their age like, such as birthday parties
  • preferring to play alone, rather than asking others to play with them
  • rarely using gestures or facial expressions when communicating
  • avoiding eye contact


  • having repetitive movements, such as flapping their hands, rocking back and forth, or flicking their fingers
  • playing with toys in a repetitive and unimaginative way, such as lining blocks up in order of size or colour, rather than using them to build something
  • preferring to have a familiar routine and getting very upset if there are changes to this routine
  • having a strong like or dislike of certain foods based on the texture or colour of the food as much as the taste
  • unusual sensory interests – for example, children with ASD may sniff toys, objects or people inappropriately

Signs and symptoms of ASD in school-age children

Spoken language

  • preferring to avoid using spoken language
  • speech that sounds very monotonous or flat
  • speaking in pre-learned phrases, rather than putting together individual words to form new sentences
  • seeming to talk "at" people, rather than sharing a two-way conversation

Responding to others

  • taking people’s speech literally and being unable to understand sarcasm, metaphors or figures of speech
  • reacting unusually negatively when asked to do something by someone else

Interacting with others

  • not being aware of other people’s personal space, or being unusually intolerant of people entering their own personal space
  • little interest in interacting with other people, including children of a similar age, or having few close friends, despite attempts to form friendships
  • not understanding how people normally interact socially, such as greeting people or wishing them farewell
  • being unable to adapt the tone and content of their speech to different social situations – for example, speaking very formally at a party and then speaking to total strangers in a familiar way
  • not enjoying situations and activities that most children of their age enjoy
  • rarely using gestures or facial expressions when communicating
  • avoiding eye contact


  • repetitive movements, such as flapping their hands, rocking back and forth, or flicking their fingers
  • playing in a repetitive and unimaginative way, often preferring to play with objects rather than people
  • developing a highly specific interest in a particular subject or activity
  • preferring to have a familiar routine and getting very upset if there are changes to their normal routine
  • having a strong like or dislike of certain foods based on the texture or colour of the food as much as the taste
  • unusual sensory interests – for example, children with ASD may sniff toys, objects or people inappropriately

Other conditions associated with ASD

People with ASD often have symptoms or aspects of other conditions, such as:

If your child has any of these problems, they may benefit from separate treatment, such as medication or cognitive behavioural therapy (CBT), in addition to their treatment for ASD.

Read more about treating ASD.

Who can get it

The exact cause of autism spectrum disorder (ASD) is currently unknown.

It's a complex condition and may occur as a result of genetic predisposition (a natural tendency), environmental or unknown factors.


Most researchers believe that certain genes a child inherits from their parents could make them more vulnerable to developing ASD.

Cases of ASD have been known to run in families. For example, younger siblings of children with ASD can also develop the condition, and it's common for identical twins to both develop ASD.

No specific genes linked to ASD have been identified, but it may be a presenting feature of some rare genetic syndromes, including Fragile X syndrome, Williams syndrome and Angelman syndrome.

Environmental triggers

Some researchers believe that a person born with a genetic vulnerability to ASD only develops the condition if they're exposed to a specific environmental trigger.

Possible triggers include being born prematurely (before 35 weeks of pregnancy), or being exposed in the womb to alcohol or to certain medication, such as sodium valproate (sometimes used to treat epilepsy during pregnancy).

No conclusive evidence has been found linking pollution or maternal infections in pregnancy with an increased risk of ASD.

Other health conditions

Below are some other conditions known to be associated with ASD:

  • muscular dystrophy – a group of inherited genetic conditions that gradually cause the muscles to weaken
  • Down's syndrome – a genetic condition that typically causes a learning disability and a range of physical features
  • cerebral palsy – conditions that affect the brain and nervous system, causing problems with movement and co-ordination
  • infantile spasms – a type of epilepsy that develops while a child is still very young (usually before they're one year old)
  • neurofibromatosis – a number of genetic conditions that cause tumours to grow along the nerves (the main types are neurofibromatosis type 1 and neurofibromatosis type 2)
  • the rare genetic conditions fragile X syndrome, tuberous sclerosis and Rett syndrome

Misconceptions about the causes of ASD

In the past, a number of things were linked to ASD, but extensive research has found no evidence to suggest that any of these contribute to the condition. These include:

  • the MMR vaccine
  • thiomersal – a compound that contains mercury, which is used as a preservative in some vaccines
  • the way a person has been brought up
  • diet, such as eating gluten or dairy products


See your GP or health visitor if your child is showing symptoms of autism spectrum disorder (ASD), or you're worried about their development.

If appropriate, your GP can refer you to a healthcare professional or team who specialise in diagnosing ASD, or someone who has access to such a team.

The specialist or specialist team will make a more in-depth assessment, which should be started within three months of the referral.

If you're referred to an individual specialist, they may be a:

  • psychologist – a healthcare professional with a psychology degree, plus further training and qualifications in psychology
  • psychiatrist – a medically qualified doctor with further training in psychiatry
  • paediatrician – a doctor who specialises in treating children
  • speech and language therapist – a specialist in recognising and treating communication problems

Some local health boards use multidisciplinary teams. These are a combination of specialists who work together to make an assessment.


A diagnosis of ASD is based on the range of features your child is showing.

For most children:

  • information will be needed from your GP, nursery or school staff, plus speech and language and occupational therapists, about your child's development, health and behaviour
  • a speech and language therapist, and often an occupational therapist, will carry out an assessment
  • a detailed physical examination will need to be carried out to rule out possible physical causes of your child's symptoms, such as an underlying condition like neurofibromatosis or Down's syndrome
  • the assessment will include a check for any coexisting physical health conditions and mental health problems

In addition, for some children:

  • you may be asked to attend a series of interviews so a detailed family history and the history of your child's development and behaviour can be drawn up
  • your child may be asked to attend a series of appointments so specific skills and activities can be observed and assessed

Once this process is complete, a diagnosis of ASD may be confirmed.

After diagnosis

When a child is diagnosed with ASD, many parents are keen to find out as much as they can about the condition. The National Autistic Society has an excellent range of resources and advice.

Diagnosing ASD in adults

Some people with ASD grow up without their condition being recognised, but it's never too late to get a diagnosis. Some people may be scared of being diagnosed because they feel it will "label" them, and lower other people's expectations of them.

But there are several advantages to getting a diagnosis. It helps people with the condition and their families understand ASD and decide what sort of support they need. A diagnosis may also make it easier to access autism-specific services and claim benefits.

See your GP if you think you may have ASD and ask them to refer you to a psychiatrist or clinical psychologist. The National Autistic Society website has information about being diagnosed with ASD if you're an adult.

If you're already seeing a specialist for other reasons, you may want to ask them for a referral instead. However, many areas don't provide NHS funding for diagnosing ASD in adults.

Read more about advice for adults living with ASD.

You can also read the NICE guidelines about the recognition, referral, diagnosis and management of adults on the autism spectrum (PDF, 267kb).


There's no 'cure' for autism spectrum disorder (ASD). However, a range of specialist educational and behavioural programmes can help children with ASD.

It can be difficult to know which intervention will work best for your child, because each person with ASD is affected differently.

Some types of intervention can involve hours of intensive work, and this isn't always possible for many families because of the practical, emotional and financial commitments necessary.

The National Autistic Society website has information about the many different strategies and approaches available for ASD.

Any intervention should focus on important aspects of your child's development. These are:

  • communication skills – such as using pictures to help communicate (as speech and language skills are usually significantly delayed)
  • social interaction skills – such as the ability to understand other people's feelings and respond to them
  • imaginative play skills – such as encouraging pretend play
  • academic skills – the "traditional" skills a child needs to progress with their education, such as reading, writing and maths

The detailed assessment, management and co-ordination of care for children and young people with ASD should involve local specialist community-based multidisciplinary teams (sometimes called "local autism teams") working together. The team may include:

  • a paediatrician
  • mental heath specialists, such as a psychologist and psychiatrist
  • a learning disability specialist
  • a speech and language therapist
  • an occupational therapist
  • education and social care services

Local autism teams should ensure that every child or young person diagnosed with ASD has a case manager or key worker to manage and co-ordinate their treatment, care and support, as well as their transition into adult care.

The Research Autism website provides details of the many different types of autism interventions, treatments and therapies.

Parent education and training

The parents of a child with ASD play a crucial role in supporting their child and improving their skills.

If your child has ASD, it's a good idea to find out as much as you can about the condition. The National Autistic Society website provides useful information and advice for parents, relatives and carers.

The Research Autism website is also a good source of information and has a section about the different issues that living with autism presents, including the impact of autism on the family.

Communication advice for parents

Communication is particularly challenging for children with ASD. Helping your child to communicate can reduce anxiety and improve behaviour.

The following tips may be useful when communicating and interacting with your child:

  • use your child's name, so they know you're addressing them
  • keep background noise to a minimum
  • keep language simple
  • speak slowly and clearly, with pauses between words
  • accompany what you say with simple gestures
  • allow extra time for your child to process what you've said

Parent support programmes

In-depth advice and support programmes are available for parents of children recently diagnosed with ASD.

For example, the EarlyBird programme provided by The National Autistic Society is a free three-month course for parents whose child has been diagnosed with ASD, but hasn't started school yet.

The programme aims to inform and support parents, and offers practical advice about looking after their child and helping them improve their skills.

EarlyBird Plus is for parents of children who have received a later diagnosis of ASD and are four to eight years of age. The programme aims to address the child's needs at both home and school by training parents and carers, together with a professional who regularly works with their child.

EarlyBird and EarlyBird Plus programmes are run by licensed teams and are available in most parts of the UK. To find out if there's a team in your area, call 01226 779218 or email earlybird@nas.org.uk.

Psychological treatments

If your child's behaviour is causing problems, they'll be assessed for possible triggers, such as a physical health condition, mental health problem, or environmental factors.

In cases where a child with ASD also has a mental health problem, such as anxiety, a psychological treatment may be offered.

Psychological treatments, such as cognitive behavioural therapy (CBT), involve talking to a trained therapist about thoughts and feelings, and discussing how these affect behaviour and wellbeing.

You can read more about CBT and autism on the Research Autism website.


In some cases, medication may be prescribed to treat some of the symptoms or conditions associated with ASD. For example:

These medications can have significant side effects and are usually only prescribed by a doctor who specialises in the condition being treated. If medication is offered, your child will have regular check-ups to assess whether it's working.

Treatments not recommended

A number of alternative treatments have been suggested for ASD. However, these should be avoided, because there's little or no evidence that they're effective and some may even be potentially dangerous.

Treatments that aren't recommended for ASD include:

  • special diets – such as gluten-free or casein-free diets
  • neurofeedback – where brain activity is monitored (usually by placing electrodes on the head) and the person being treated can see their brain activity on a screen and is taught how to change it
  • auditory integration training – a therapy that involves listening to music that varies in tone, pitch and volume
  • chelation therapy – which uses medication or other agents to remove metal (in particular, mercury) from the body
  • hyperbaric oxygen therapy – treatment with oxygen in a pressurised chamber
  • facilitated communication – where a therapist or another person supports and guides a person's hand or arm while using a device such as a computer keyboard or mouse

Funding treatments

Some of the interventions for ASD take a lot of time and labour, and can cost a significant amount of money if not available on the NHS.

Local education authorities (LEAs) sometimes provide partial or total funding towards specialist education and training, but this varies widely between LEAs.

Read more about Special Educational Needs and Disability (SEND).

If you would like more information and advice about what funding is available and how to request it, The National Autistic Society runs a special service called the Education Rights Service.

Living with

Some people with autism spectrum disorder (ASD) grow up without their condition being recognised, sometimes through choice.

However, a diagnosis can make it easier to access a range of support services that may be available locally.

It is never too late to be diagnosed with ASD, although it is not always easy because some local Health Boards do not provide NHS funding for diagnosing ASD in adults.

See the National Autistic Society website for a range of diagnosis information for adults.

Treatment and support

With a proper diagnosis, adults with ASD may be able to access local autism support services, if these are available in their area. You can search for services for adults using the Autism Services Directory.

The healthcare professionals who diagnose you with ASD can usually offer more information and advice about the care and support services available to you.

Examples of programmes that may be available in your local area include:

  • social learning programmes to help you cope in social situations
  • leisure activity programmes, which involve taking part in leisure activities (such as games, exercise, and going to the cinema or theatre), usually with a group of other people
  • skills for daily living programmes to help you if you have problems carrying out daily activities, such as eating and washing

Adults with ASD may also benefit from some of the treatments offered to children with ASD, such as psychological therapy and medication.


Adults diagnosed with ASD can also claim some benefits, such as Personal Independence Payment (PIP). This is the new benefit that is replacing Disability Living Allowance (DLA) for people with a disability aged 16 to 64.

You can find out what benefits for adults with autism you may be entitled to on the National Autistic Society website, or you can visit GOV.UK to read more about benefits.


Adults with ASD can live in all types of housing. Some people may be suited to a residential care home, while others may prefer to live on their own and receive home support. Others live completely independently.

Supported living can work very well for some adults with ASD as it means they can choose a place to live in the community, they can live alone or with other people, and they can get the support they need. They may need 24-hour care, or they may only need help with important tasks for a couple of hours each week.

The level of support an adult with ASD needs is decided after your local authority's social services make an assessment and it is agreed with the person and their carer.


It can be difficult for people with ASD to find a job. For example, they may find the work environment too noisy, or travelling to work too stressful because of the crowds. Sudden changes in routine can also be upsetting.

However, in the right job and with the right support, people with ASD have much to offer. They are often accurate, reliable and have a good eye for detail. Being in a working environment can help the individual's personal development tremendously.

If you are having problems getting a job or staying in a job, you may be able to access a supported employment programme in your local area. These are programmes that can help you write your CV and job applications, and prepare for interviews.

These programmes can also help you to choose which jobs would suit you and provide training for that role.

Those providing the programme can also advise employers about any changes that need to be made to the workplace to suit people with autism, and support you and the employer before and after you have started work.

See the National Autistic Society website to find help with getting a job.

Making decisions

Someone with ASD may have the capacity to make some decisions (for example, to decide what items to buy at the local shop), but lack capacity to make other decisions (for example, making decisions about complex financial issues).

Where someone is judged not to have the capacity to make a specific decision after they've had a capacity assessment, that decision can be taken for them – but it must be in their best interests.

Caring for an adult with ASD

Many adults with ASD continue to live in their family home, and some are cared for by family members. Caring for anyone with a disability can be challenging, and parents may need additional support.

If you're caring for an adult with ASD, you may consider respite care. This is short-term care provided either in or outside the family home. It is funded by your local authority and gives families and carers of people with ASD a break from their daily care routine.

More information about being  a carer can be found here.

The information on this page has been adapted by NHS Wales from original content supplied by NHS UK NHS website nhs.uk
Last Updated: 02/07/2021 09:12:45