Yes, you can absolutely be autistic and not know it, especially if traits were mild, masked, or didn't fit stereotypes (more common in women/girls), leading many to self-discover or get diagnosed as adults after experiencing social difficulties, sensory issues, or a need for routine that they couldn't explain. Many learn to hide their autistic traits (masking) to fit in, making it hard to recognize.
Main signs of autism
finding it hard to make friends or preferring to be on your own. seeming blunt, rude or not interested in others without meaning to. finding it hard to say how you feel. taking things very literally – for example, you may not understand sarcasm or phrases like "break a leg"
Understand Nonspeaking Habits
“When a person with autism is nonspeaking, they do not communicate using spoken language, including vocalizations or sounds which have symbolic meaning,” explains Meghan O'Neill, MD, a neurodevelopmental disabilities physician at Ann & Robert H.
The phrase “high-functioning” doesn't have a clear definition. Dr. Wong prefers sticking with the medical terminology because it's defined in the DSM-5. “I try to educate parents so that they use the term 'level one autism' instead,” she says.
Seven key signs of autism spectrum disorder (ASD) often involve challenges with social communication (like avoiding eye contact, not responding to names), restricted/repetitive behaviors (like repetitive movements or strict routines), sensory sensitivities (unusual reactions to sounds, lights, textures), and difficulties with emotional understanding or verbal expression, though signs vary greatly and appear differently across ages. Key indicators include limited gestures, delayed speech, intense focus on specific objects, difficulty with pretend play, and strong distress when routines change.
Around 90% of autism cases are attributed to genetic factors, meaning autism is highly heritable, with many different genes contributing, rather than a single cause, often interacting with environmental influences during early brain development, though specific environmental factors don't cause it but can increase risk. Twin studies show strong genetic links, with concordance rates between 60-90% in identical twins, and research points to complex interactions of many genes and prenatal/perinatal factors.
Physical Symptoms:
Conditions That Can Be Mistaken for Autism. These include: Speech delays, hearing problems, or other developmental delays: Developmental delays are when your child doesn't do things doctors expect kids their age to be able to do. These can include language, speech, or hearing problems.
The "6-second rule" for autism is a communication strategy where a speaker pauses for about six seconds after asking a question or giving information, giving the autistic person extra time to process it without feeling rushed, which helps reduce anxiety and allows for a more thoughtful response, reducing frustration for both parties. Instead of repeating or rephrasing, which can be confusing, you wait, and if needed, repeat the exact same words after the pause.
Chinning is a form of repetitive self-stimulatory behavior (stimming) that you may notice in children or adults with autism. It involves pressing, rubbing, or holding the chin against objects, surfaces, or even hands to gain sensory input or comfort.
People with ASD often have problems with social communication and interaction, and restricted or repetitive behaviors or interests. People with ASD may also have different ways of learning, moving, or paying attention. It is important to note that some people without ASD might also have some of these symptoms.
Meltdowns can be expressed verbally (eg, shouting, growling, or crying), physically (eg, kicking or flapping) or a mixture of both ways. An autistic person will lose control of their behaviour because they are completely overwhelmed and are unable to express themselves another way.
The Autism Spectrum Disorder person often has no idea what he or she is feeling, and even less how you are feeling. Discussions tend to stay at a superficial level, often focused on facts, ignoring subtly and nuance, and with little regard to multiple perspectives on any given position.
changing speech or tone of voice, for example by using less direct phrasing, or being more or less animated. suppressing, reducing or hiding stimming (such as hand flapping or echolalia), or switching to less noticeable stims such as playing with a pen.
Top 10 Calming Strategies for Autism
Signs and Symptoms of Borderline Autism
Children with autism may exhibit rigidity, inflexibility and certain types of repetitive behavior such as: Insistence on following a specific routine. Having difficulty accepting changes in the schedule. A strong preoccupation with a particular interest.
"Looping" in autism refers to getting "stuck" in repetitive mental cycles, replaying thoughts, questions, worries, or phrases endlessly, often triggered by stress, sensory overload, or uncertainty, and linked to challenges with executive function and attention. It's a non-clinical term for perseveration or rumination, where an autistic individual's brain struggles to shift focus from an internal loop, which can be mentally exhausting but sometimes also comforting.
There's no single "hardest" age for autism; challenges shift across developmental stages, with preschool (2-5) often tough due to noticeable differences in social/language skills, elementary (6-10) marked by growing academic/social demands, and adolescence (11-17) frequently being overwhelming due to complex social pressures, puberty, and identity formation, say Bluebell ABA Therapy and Blossom ABA Therapy. While early childhood (ages 3-6) sees initial progress for many, this often stalls around age six, a critical turning point where increased support is crucial, according to research, notes The Transmitter.
Here are five common false signs of autism that are often misunderstood.
Mental health problems
Many autistic people have problems like: feeling very worried a lot of the time (anxiety) feeling unhappy, irritable or hopeless (depression) feeling a need to keep doing certain actions (obsessive compulsive disorder, or OCD)
Symptoms of High-Functioning Autism
Difficulty with Social Interaction: Individuals with high-functioning autism may struggle to understand social norms, make eye contact, initiate or maintain conversations, and interpret nonverbal cues such as facial expressions or body language.
Most cases are diagnosed between the ages of five and nine, with some diagnosed as early as age three.
The different types of autism include autism spectrum disorder (ASD), autistic disorder (classic autism), Asperger's syndrome, pervasive developmental disorder not otherwise specified (PDD-NOS), childhood disintegrative disorder (CDD), and Rett syndrome.
Someone with ADHD is more likely to seek out novelty and make more impulsive decisions, whereas an autistic person is more likely to crave routine and structure.