3 Types of Autism Spectrum Disorder: Symptoms of Each Level Explained Simply

3 Types of Autism Spectrum Disorder: Symptoms of Each Level Explained Simply

If your child was just diagnosed with autism spectrum disorder (ASD), you probably heard terms like "Level 1," "Level 2," or "Level 3."

What do these autism levels actually mean? And how are they different from the old terms like Asperger’s or PDD-NOS?

In 2013, doctors stopped using separate autism types. Instead, they combined everything into one diagnosis: autism spectrum disorder. But they added 3 levels to show how much support a person needs.

This guide explains each level in simple words. No medical jargon. Just what you need to know as a parent.

Why Did Autism Types Change to Levels?

Before 2013, doctors used different names:

  • Autistic Disorder – Classic autism
  • Asperger’s Syndrome – Mild autism with no speech delay
  • PDD-NOS – Atypical autism
  • Childhood Disintegrative Disorder – Rare and severe

The problem? Two kids with "Asperger’s" could be totally different. One might live alone and work. Another might need daily help.

So the DSM-5 created one autism spectrum with 3 support levels. This helps doctors, schools, and families understand exactly how much help a child needs right now.

Important: These levels are not fixed. A child can move from Level 2 to Level 1 with therapy and support. The level describes needs today, not forever.

Level 1 Autism Spectrum Disorder: "Requiring Support"

Old name: This is what used to be called Asperger’s Syndrome or "high-functioning autism."

What it looks like:

Social Communication:

  • Can talk in full sentences and has normal or high intelligence
  • But struggles with back-and-forth conversation
  • Hard time making friends or understanding social rules
  • May seem "awkward" or talk too much about one topic
  • Doesn’t pick up on body language, sarcasm, or jokes

Behavior & Interests:

  • Needs routine. Changes cause stress or meltdowns
  • Intense focus on specific interests: trains, maps, dinosaurs, numbers
  • Sensitive to loud sounds, bright lights, or clothing tags
  • Can organize and plan, but gets overwhelmed easily

Support needed: Someone with Level 1 autism can live independently as an adult. But they often need therapy for social skills, anxiety, or help managing work and relationships. Without support, social problems are noticeable.

Example: A 10-year-old who gets straight A’s in math, but eats lunch alone every day because he doesn’t know how to join a group. He melts down if the school schedule changes.

Level 2 Autism Spectrum Disorder: "Requiring Substantial Support"

Old name: This was usually called "classic autism" or "moderate autism."

What it looks like:

Social Communication:

  • Speaks in simple sentences or short phrases
  • Very limited back-and-forth conversation
  • Struggles to understand nonverbal cues like facial expressions
  • May not respond when name is called
  • Social interactions feel "odd" to others even with support

Behavior & Interests:

  • Distressed by changes in routine. Transitions are very hard
  • Repetitive behaviors are obvious: hand flapping, rocking, spinning
  • Narrow interests that interfere with daily life
  • Strong sensory issues: covers ears, refuses certain foods, hates haircuts

Support needed: Needs substantial help every day. Speech therapy, occupational therapy, and behavioral therapy are usually needed. Many kids need an aide at school. Adults may live semi-independently with support.

Example: A 6-year-old who can ask for "juice" but can’t answer "How was school?" He lines up toys for hours and screams if someone moves them. He needs help getting dressed and using the bathroom.

Level 3 Autism Spectrum Disorder: "Requiring Very Substantial Support"

Old name: This was called "severe autism" or "low-functioning autism."

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