These differences may affect social communication, social interactions, behavior, motor skills, and daily life support needs.
According to the Centers for Disease Control and Prevention (CDC), autism spectrum disorder affects how people communicate, interact with others, and experience the world.
The American Psychiatric Association also describes autism as a spectrum because no two people experience it in exactly the same way.
How Many Different Forms of Autism Are There?
There is a lot of information about autism spectrum disorder (ASD), and it’s common to wonder whether there are different types or kinds of autism. While autism can look very different from one person to another, there is only one formal diagnosis: autism spectrum disorder.
Autism is classified as a single condition, even though it can be present in many ways. For example, one person may find unexpected changes very difficult, while another may adapt more easily. Both individuals can still meet the criteria for a diagnosis of autism.
These differences are often why people assume there are multiple autism types. These differences reflect variations in traits—not separate diagnoses.
Another reason for this confusion is how professionals describe support needs. The Diagnostic and Statistical Manual of Mental Disorders (DSM‑5) outlines three levels of support based on how autism affects daily life.
How Autism Support Levels Are Determined
The DSM‑5 does not assign one overall severity level for autism. Instead, professionals look at two areas separately: social communication and restricted or repetitive behaviors. This helps give a clearer picture of how autism affects daily life.
These types of ratings are used across many mental health conditions. They are meant to guide support, not define different types of autism.
Speaking with a trained professional can help explain what these levels mean for each individual or family:
Diagnostic and Statistical Manual of Mental Disorders (DSM‑5)
- Level 1: Requiring support
- Level 2: Requiring substantial support
- Level 3: Requiring very substantial support
These levels do not define different kinds of autism. Instead, they describe how much support a person may need in areas like communication, social interaction, and daily routines.
They are used as a guide and may vary depending on how professionals assess individual needs, which has been noted in research on DSM‑5 support levels.
It’s also important to understand how autism was classified in the past. Before 2013, conditions such as Asperger’s syndrome and pervasive developmental disorder–not otherwise specified (PDD‑NOS) were considered separate diagnoses.
When the DSM‑5 was published, these categories were combined into a single diagnosis: autism spectrum disorder.
Today, autism is understood as a spectrum with a wide range of traits and support needs. While older terms may still appear in conversations or past records, they are no longer used as official diagnoses.
A Historical Look at Autism Forms
Before autism was defined as a spectrum, it was grouped under a category called pervasive developmental disorders. Several diagnoses were used to describe patterns that are now understood as overlapping traits.
Autistic Disorder (Classic Autism)
Autistic disorder, sometimes called classic autism, described individuals with more noticeable differences in communication and behavior during early childhood. These differences often affect social communication and daily interactions.
Asperger’s Syndrome
Asperger’s syndrome was used for individuals who developed spoken language on time but had trouble with social interactions and social skills. Although it is no longer a separate diagnosis, the term is still commonly used in everyday language and educational settings.
Childhood Disintegrative Disorder and Rett Syndrome
Childhood disintegrative disorder described a rare pattern in which a child lost previously learned skills after typical early development. Rett syndrome, which is linked to a genetic mutation, was once grouped with autism but is now recognized as a separate condition.
These categories were combined because they did not fully reflect how many traits overlap across people with autism.
Moving From Old Labels to the Autism Spectrum
Today, autism is understood as a spectrum rather than separate autism types. This means individuals may share similar traits, but their experiences and support needs can vary widely.
Instead of focusing on fixed categories, current guidelines focus on how autism affects daily life. This includes communication skills, flexibility, repetitive behaviors, and support needs.
Why Autism is a Spectrum
The term “spectrum” reflects the wide range of ways autism can present. Some people may experience challenges with social communication or eye contact, while others may show more noticeable repetitive behaviors or differences in motor skills.
These traits often overlap and can change over time. Viewing autism as a spectrum helps explain why earlier attempts to define separate kinds of autism were not effective.
How Autism Differences Can Affect Daily Life
Differences in social interactions can affect conversations, relationships, and group activities. Routines or repetitive behaviors can feel comforting and predictable, but changes may be difficult.
Looking at autism through a person’s traits, instead of old historical labels, can make communication clearer and help people get the right support at school, work, and in the community.
Why Understanding Former Autism Forms Still Matters
Even though autism is now defined as a single diagnosis, older terms still appear in medical records, school documents, and everyday conversations.
Understanding these terms helps reduce confusion and supports clearer communication. It also reinforces an important idea: autism is highly individual, and no single label can fully describe a person’s experience.
About Easterseals Southern California’s Autism Services
At Easterseals Southern California, we’re here to support people with autism and their families to grow, learn, and succeed, using proven therapies that are built on science and filled with heart.
Whether it’s learning new skills, improving communication, or building confidence, the team at Easterseals Southern California is with you every step of the way.
Therapy services are offered in all the counties served by Easterseals Southern California, including: Los Angeles, Orange, San Diego, Imperial, Riverside, San Bernardino, Kern, Ventura, Santa Barbara, and San Luis Obispo Counties.
To learn more about autism and access autism support and services, visit Easterseals Southern California’s Autism Services page.
