Understanding why autism happens requires looking at the interplay between genetics, brain development, and environmental factors. No single factor causes autism; rather, multiple influences converge during critical periods of brain development.

Genetic Factors

Genetics are the strongest contributor, accounting for an estimated 60-90% of autism risk. Both inherited gene variants and spontaneous mutations play roles. Having a family member with autism increases risk, and identical twins have a 60-90% concordance rate.

Brain Development

Differences in brain development begin before birth. Research has found altered patterns of neural connectivity, differences in brain growth during early childhood, and changes in how neural connections are pruned and refined.

Environmental Contributors

• Advanced parental age
• Certain prenatal medication exposures
• Pregnancy and birth complications
• Very short spacing between pregnancies

Rising Diagnosis Rates

Autism diagnoses have increased dramatically, largely due to expanded diagnostic criteria, better awareness, and improved screening rather than an actual increase in prevalence.

What Matters Most

Regardless of cause, early, effective intervention makes the biggest difference. ABA therapy helps autistic individuals build skills and independence. Contact Treetop ABA Therapy to learn more.