In others, symptoms may not show up until 24 months of age or later. Some children show ASD symptoms within the first 12 months of life. Some people with ASD need a lot of help in their daily lives others can work and live with little to no support.ĪSD begins before the age of 3 years and can last throughout a person’s life, although symptoms may improve over time. For example, some people with ASD may have advanced conversation skills whereas others may be nonverbal. The abilities of people with ASD can vary significantly. There is often nothing about how they look that sets them apart from other people. People with ASD may behave, communicate, interact, and learn in ways that are different from most other people. We still have much to learn about these causes and how they impact people with ASD. Scientists believe there are multiple causes of ASD that act together to change the most common ways people develop. Some people with ASD have a known difference, such as a genetic condition. Autism spectrum disorder (ASD) is a developmental disability caused by differences in the brain.

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