Is mental illness genetic? Will I pass it to my children?
Answered by Dr. Nitnem Singh Sodhi · Consultant Psychologist & Psychotherapist · Updated 2026-05-22
Short answer
Most mental health conditions have a heritable component (depression ~40%, bipolar ~70%, schizophrenia ~80%) but heritability means risk, not destiny. Environment, lifestyle and early intervention substantially modify whether genes ever express as illness.
Parents-to-be with a personal or family psychiatric history often arrive in clinic with this exact question. The honest answer is reassuring and important.
What heritability really means
Heritability estimates the proportion of variation in a population explained by genes. It is not the probability your specific child will develop the condition. A 40% heritability for depression does not mean a 40% chance your child will be depressed — it means roughly 40% of why some people get depressed and others don't is genetic.
What you can do
Stable attachment in early years, predictable sleep, low-conflict home, early help-seeking when something feels off, and an open culture about emotions in the family — all measurably reduce the chance of expression. Genes load the gun; environment pulls the trigger. You have substantial say over the second half.
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