Reviewed by medical experts • For informational purposes only
Autism's causes are mostly genetic - and firmly not vaccines, not parenting, not anything a parent chose. What research actually knows, and the myths laid to rest.
Autism spectrum disorder (ASD) is a neurodevelopmental difference - the brain develops along a different path from very early in life, shaping how a person communicates, processes sensory information and experiences the world. It is not caused by anything a parent did or did not do, and it is not caused by vaccines. Research points overwhelmingly to genetics, with some additional early developmental factors. For a reliable overview, see NHS guidance on autism.
Autism is one of the most heritable neurodevelopmental conditions. Hundreds of genes contribute - most commonly as a combination of many small genetic variations inherited from parents, and sometimes as a new (de novo) genetic change arising for the first time in the child. Twin studies show that when one identical twin is autistic, the other has a very high likelihood of being autistic too. Specific genetic syndromes (such as Fragile X) account for a small percentage of cases.
Some factors modestly raise the statistical likelihood - none of them is a "cause" a parent chose:
Classical Ayurvedic texts have no concept equivalent to autism. They describe isolated symptoms - a child unable to speak (Muka), unclear speech (Gadgada), developmental dullness (Jada) - but never the developmental pattern that defines autism. Any source claiming an "ancient Ayurvedic description of autism" is overstating history. The classical texts do offer gentle child-development principles (a calm environment, no frightening of children - Charaka Samhita, Sharira Sthana 8), but autism's causes, as far as modern evidence reaches, are genetic and developmental - not dietary sins, karma, or parental error.
If autism is genetic, why does no one in our family have it? Genetic conditions can appear without a family history - through new genetic changes, or combinations of ordinary variations from both parents. Absence of family history is common and does not contradict a genetic basis.
Can autism be detected before birth? No reliable prenatal test exists. Autism is a behavioural-developmental diagnosis made in early childhood, usually recognisable by age two or three.
Does mercury in anything cause autism? No. Studies examining mercury exposure, including the old vaccine preservative (removed long ago from childhood vaccines in most countries), found no link to autism.
Why are more children diagnosed now than 30 years ago? Mostly broader definitions, better recognition (including in girls), and awareness - the spectrum was widened to include people who were always there but were called "shy," "slow" or "eccentric" instead.
Written By
Dr. Daksh
BDS
Reviewed By
Dr. Varun Gupta
MD Pharmacology, MBBS
Last updated on
27 Sep 2022 • 06:23 PM (IST)
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