Autism spectrum disorder (ASD) is a developmental disability that can cause significant social, communication and behavioural challenges.
Contrary to stereotypes, there is often nothing about how people with ASD looks that sets them apart from other people, but people with ASD may communicate, interact, behave, and learn in ways that are different from neurotypical people.
ASD occurs in all racial, ethnic, and socioeconomic groups, but is about four times more common among boys than girls. There are also no known causes of ASD. Different factors can play a part in a child’s condition, including environmental, biological, and genetic factors.
Autism has many subtypes that can be influenced by genetic and environmental factors. Because autism is a spectrum disorder, each person with autism has a distinct set of strengths and challenges. The learning, thinking, and problem-solving abilities of people with ASD can range from gifted to severely challenged. While some people with ASD may require significant support in their daily lives, others may need less support and, in some cases, live entirely independently.
Symptoms can vary from person to person, but people on the spectrum can face some common social communication difficulties and/or restricted and repetitive behaviours such as:
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Social communication and interaction
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Repetitive behaviours or restricted interests
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Fixed routines and rituals
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Resistance to changes or transitions
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Unusual interests in or sensitivity to sensory input
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Delays in social or language developmental milestones
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Unusually intense interests




