Yes, it is possible for someone to be autistic and not know it, which is often the case for adults who were not diagnosed in childhood. Many people go through life feeling "different" or "out of place" without understanding why, until they discover they are on the autism spectrum later in life.
Autism presents differently in different people. The signs that people notice in children and adults are usually consistent with the core characteristics of autism, but this isn't always obvious. For many autistic adults, signs were missed in their childhood.
Signs of autism in adults
Being autistic means you may feel things and react to them differently to non-autistic people. You may find socialising confusing or tiring, and you may become overwhelmed in loud or busy places.
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.
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.
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.
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.
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.
Autistic people may prefer following set routines or rituals (including having or using favourite items), knowing what is going to happen in advance and for rules to be the same for everyone. These characteristics may help you plan and organise and keep calm and happy.
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.
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.
Often children show symptoms of autism within the first year of life. A small number of children with the condition appear to develop as expected in the first year. Then between 18 and 24 months of age, they may lose some skills and develop autism symptoms.
Some autistic people have interests in things that other people may find unusual (or unusual for their age) or very specific. For example, a specific type of engine, an animated TV series or a niche academic interest. Having very intense, uncommon interests is a well-known sign that a child or adult may be autistic.
Changes in the diagnostic criteria and increased screening at wellness visits seem to be the main contributors.
Additionally, inherited genetic variations contribute greatly. Research shows that both mothers and fathers can carry autism-related gene variants. Some of these are common variants that increase the risk of autism, while others are rare mutations causing more severe effects.
Donald Triplett, autism's 'Case 1,' dies at 89. Triplett gained media attention for his autism later in life, and he became the face of the effort to research the lives of older adults with autism.
Physical Symptoms:
Top 10 Calming Strategies for Autism
Autism red flags involve challenges with social communication (like avoiding eye contact, not responding to name by 12 months, lack of shared smiles/pointing) and restricted, repetitive behaviors (like hand-flapping, strong routines, lining up toys, intense fixations, sensory sensitivities, or loss of skills). Early signs in infants include no warm smiles by 6 months or no back-and-forth gestures by 12 months; regression (losing skills) is a major flag. If you notice these, seek immediate evaluation from your pediatrician.
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.
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.
When someone is in a state of high anxiety or flooded with sensory input the brain can become overwhelmed and demand a fight, flight, or freeze response from the body. In autistic people this can result in a meltdown (the equivalent of the 'fight' response) which is often mistaken for a temper tantrum.