Many people who seek an autism assessment as adults tell a similar story: they spent years believing their difficulties were caused by social anxiety. Some were formally diagnosed with Social Anxiety Disorder (SAD), while others were simply described as shy, introverted, or lacking confidence.
Although autism and social anxiety can look similar on the surface, they are fundamentally different conditions. Autism is a neurodevelopmental difference present from early childhood, whereas social anxiety is an anxiety disorder characterised by fear of negative evaluation by others. Research and clinical experience suggest that some autistic people, particularly those who mask their differences well, may initially be mistaken for having social anxiety alone.
In this article, we’ll explore the DSM-5 diagnostic criteria for both conditions, examine where they overlap, and explain the key differences that may indicate the need for an autism assessment.
What is Social Anxiety Disorder?
According to the DSM-5, Social Anxiety Disorder is characterised by a marked fear or anxiety about social situations where a person may be scrutinised by others. The individual fears that they will do something embarrassing, be judged negatively, or be rejected.
DSM-5 Diagnostic Criteria for Social Anxiety Disorder
To receive a diagnosis of Social Anxiety Disorder, a person must typically experience:
- Marked fear or anxiety about one or more social situations where they may be observed or evaluated by others.
- Fear that they will act in a way that leads to embarrassment, humiliation, rejection, or offence.
- Social situations almost always provoke anxiety.
- Social situations are avoided or endured with significant distress.
- The fear is disproportionate to the actual threat posed.
- Symptoms persist for six months or more.
- Symptoms cause significant distress or impairment in daily functioning.
- Symptoms are not better explained by another mental health condition, substance use, or medical condition.
The key feature is fear of social judgement. People with social anxiety generally understand social rules and social cues but worry excessively about how others perceive them.
What Is Autism Spectrum Disorder?
Autism Spectrum Disorder (ASD) is a neurodevelopmental condition that affects how a person experiences social communication, relationships, routines, interests, and sensory information. The condition is present from early development, although it may not be recognised until later in life.
DSM-5 Diagnostic Criteria for Autism Spectrum Disorder
According to the DSM-5, all three of the following social communication differences must be present:
A. Persistent differences in social communication and interaction
- Differences in social-emotional reciprocity:
- Difficulties with back-and-forth conversations.
- Reduced sharing of interests, emotions, or experiences.
- Challenges initiating or responding to social interactions.
- Differences in non-verbal communication:
- Differences in eye contact.
- Difficulties understanding facial expressions, gestures, or body language.
- Challenges integrating verbal and non-verbal communication.
- Differences in developing and maintaining relationships:
- Difficulties making or maintaining friendships.
- Challenges understanding social expectations.
- Difficulties adjusting behaviour across different social contexts.
B. Restricted and repetitive patterns of behaviour, interests or activities
At least two of the following must be present:
- Repetitive movements, speech, or behaviours.
- Strong preference for routines and predictability.
- Highly focused or intense interests.
- Sensory differences, including being over- or under-sensitive to sensory input.
In addition:
- Symptoms must have been present from early development.
- Symptoms must cause clinically significant functional impact.
- Difficulties cannot be better explained by intellectual disability alone.
Why Autism and Social Anxiety Can Look Similar
There are several reasons why autism and social anxiety can be confused.
Both can involve:
- Avoiding social situations.
- Difficulties making friends.
- Feeling uncomfortable in groups.
- Reluctance to initiate conversations.
- Social exhaustion.
- Increased anxiety during social interactions.
- Difficulties in workplace or educational environments.
An autistic person may appear anxious in social settings because social situations can be confusing, unpredictable, overwhelming, or sensory-intensive. Likewise, someone with social anxiety may avoid social situations because they fear being judged.
From the outside, the behaviours can appear remarkably similar.
Why Some Autistic People Are Initially Diagnosed with Social Anxiety
Historically, diagnostic assessments often focused on what was visible during adulthood rather than exploring developmental history in depth.
Many autistic people learn to mask or camouflage their differences by consciously studying and copying social behaviours. Masking can make autistic traits less obvious to others but often comes at a significant emotional cost. Some autistic people report feeling anxious before social events because they are anticipating the effort required to navigate complex social environments.
Because anxiety is often the most obvious presenting concern, clinicians may identify social anxiety while missing the underlying autistic differences.
This can be particularly true for:
- Autistic women and girls.
- High-masking autistic adults.
- Individuals with average or above-average intelligence.
- Those who have developed compensation strategies over many years.
In these cases, anxiety may be a consequence of living in a world that does not naturally fit their neurotype, rather than the primary cause of their social difficulties.
The Key Difference: Why Are Social Situations Difficult?
This is often the most helpful question when distinguishing between autism and social anxiety.
In Social Anxiety Disorder
The person usually understands social rules and social expectations but fears negative evaluation.
They might think:
- “What if I embarrass myself?”
- “What if people think I’m stupid?”
- “Everyone is judging me.”
The anxiety stems from fear of scrutiny and rejection.
In Autism
The difficulty is often rooted in differences in social processing and communication.
The person might wonder:
- “What does that facial expression mean?”
- “When is it my turn to speak?”
- “Why did everyone laugh?”
- “What am I supposed to do in this situation?”
The challenge is not primarily fear of judgement, but navigating social interaction itself.
Other Signs That May Suggest Autism Rather Than Social Anxiety
If you are experiencing the following issues, you may want to consider assessment for autism:
- A lifelong history of feeling different from peers.
- Strong reliance on routine and predictability.
- Intense interests.
- Sensory sensitivities to sound, light, touch, smell, or texture.
- Difficulties understanding unwritten social rules.
- Taking language literally.
- Social exhaustion after interacting with others.
- Repetitive behaviours or stimming.
- Childhood differences in social communication.
These features are not explained by Social Anxiety Disorder alone and may indicate autism.
Can Someone Have Both Autism and Social Anxiety?
Yes.
In fact, anxiety is common amongst autistic people. Clinical experience and research show that many autistic individuals experience elevated levels of anxiety, including social anxiety.
An autistic person may genuinely fear negative evaluation while also experiencing underlying differences in social communication and sensory processing.
This is why a comprehensive assessment should consider whether anxiety is the primary difficulty or whether it sits alongside an undiagnosed neurodevelopmental condition.
When Should You Seek an Autism Assessment?
Consider seeking an autism assessment if:
- Your social difficulties have been present since childhood.
- Anxiety treatments have helped only partially.
- You have been diagnosed with social anxiety but still feel something does not fully explain your experiences.
- You experience significant sensory sensitivities.
- You have a strong need for routine and predictability.
- You frequently feel as though you are “acting” or masking in social situations.
- You identify with autistic experiences beyond anxiety alone.
- Family members have suggested that you may be autistic.
For many adults, receiving an autism diagnosis provides a framework that finally explains lifelong experiences that social anxiety alone never fully accounted for.
Conclusion
Autism and Social Anxiety Disorder can appear similar because both can involve social discomfort, withdrawal, and anxiety. However, they arise from very different underlying mechanisms.
Social anxiety is fundamentally a fear of being judged by others. Autism is a neurodevelopmental difference affecting social communication, sensory processing, behaviour, and relationships.
Understanding this distinction is important because the right diagnosis can help people access appropriate support, develop self-understanding, and make sense of experiences that may have felt confusing for many years. For individuals who have always felt “different” and whose social difficulties extend beyond fear of judgement, an autism assessment may provide valuable answers and a clearer understanding of themselves.
