What factors affect family recurrence rates of autism?

PostedNovember 19, 2025

UpdatedNovember 19, 2025

ByMy Patient Advice

Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

When one child is diagnosed with autism, many families understandably wonder about the likelihood of it happening again. Autism recurrence factors are influenced by a mix of genetic, biological and family factors, and they can vary from one household to another. Understanding these influences helps families make informed decisions and prepare for early observation if needed.

Research shows that the average recurrence rate, the chance of having another autistic child, is around 10 to 20 percent, significantly higher than in families with no history of autism. However, the risk level may increase or decrease depending on specific traits, number of affected family members and the presence of certain genetic markers.

What Influences Autism Recurrence?

Here are two key autism recurrence factors that shape risk across families:

Number of previously diagnosed children

Families with more than one autistic child typically face a higher recurrence rate. Each additional diagnosis may indicate a stronger inherited component or shared environmental influence, which can raise the chances for future children.

Presence of autism traits in parents or relatives

Even when family members are not formally diagnosed, traits like social difficulties, sensory sensitivities or communication differences may point to an underlying genetic profile. These family factors can subtly influence recurrence risk and justify closer developmental monitoring.

Being aware of autism recurrence factors allows families to take proactive steps in early assessment and support. Visit providers like Autism Detect for personal consultations and further guidance on screening and support.

For a deeper dive into the science, diagnosis and full treatment landscape, read our complete guide to Genetic Influences.

Lucia Alvarez, MSc

Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.