What Are Common Signs of Autism?

What are common signs of autism in kids, teens and adults?

Autism is a spectrum that presents differently from one person to another at different points in life. While some signs of autism are clear during early childhood, others don’t become apparent until adolescence or even adulthood.

Two of the most common experiences shared by people with autism at any age are stimming (repetitive, self-soothing behaviors) and difficulty navigating social interactions and norms. Whether you’re noticing signs in your child or recognizing them in yourself, gaining insight is an important step toward meaningful support.

Signs in Children

As children grow, they begin to explore the world in their own ways. These early stages of development are when parents, caregivers and teachers may notice early signs of autism. Boys often show more recognizable patterns that lead to an earlier diagnosis. Girls, on the other hand, may display more subtle signs or make more efforts to adapt to social situations. This ability to “mask” their struggles can lead to a later diagnosis than their male counterparts.

Some of the most common signs of autism in children include:

• Challenges expressing emotions or recognizing others’ feelings
• Delayed or nonexistent speech and language skills
• Delayed or nonexistent non-verbal communication skills (such as not pointing or few facial expressions)
• Difficulty starting or maintaining conversations
• Heightened sensitivity to sounds, lights or textures
• Rigidity with behaviors around eating, playing or daily routines
• Rhythmic movements like swaying or hand wringing (stimming)
• Struggles to reach developmental milestones, like making eye contact, speaking or playing with others

Signs in Teens and Young Adults

Teenage years come with more complex social expectations and independence. This stage of life can make signs of autism more noticeable, especially as communication becomes more nuanced. Subtle traits, which may have gone unnoticed earlier, often become clearer, such as:

• Anxiety in unfamiliar settings
• Deep interest in specific topics or activities, often referred to as special interests
• Preferring to spend time alone or with a small, trusted group
• Speaking in a tone or rhythm that may seem flat, formal or unique
• Strong emotional reactions to small changes in routine or unexpected events
• Struggles with executive function skills like time management, organization or task switching
• Trouble making friends or navigating social situations

Signs in Adults

Many adults reach a turning point where they begin to question long-standing patterns in their lives. Autism could be the answer for why some situations feel particularly stressful or draining compared to their peers, why relationships feel harder to maintain or why structure feels so essential. Some common adult traits include:

• A strong need for structure or routine
• Difficulty with small talk or reading social cues
• Feeling overstimulated in noisy or busy environments
• Finding comfort in repetition or predictable patterns
• Masking or “camouflaging” the above behaviors in social settings to fit in
• Past diagnoses, such as anxiety or ADHD (it’s possible to have other diagnoses and autism, but autism may better explain various symptoms)

Autism Support at Sutter

Understanding autism doesn’t change who you or your child are — it simply helps explain how you experience the world. With that knowledge, you can find autism care services that support each person’s unique needs.