Selective mutism
- Disorder
A child who can talk, and talks at home, stays silent at school or with strangers because of anxiety, not defiance.
What it is
Selective mutism is a consistent failure to speak in specific social situations where speech is expected, such as school, while the child speaks with family. It lasts at least a month (not counting the first month of school), interferes with schooling or social life and is not explained by language ability, a developmental disorder such as autism, or psychosis. It is classed as an anxiety disorder, usually begins between ages 3 and 6 and is often noticed when the child starts school; without treatment it may worsen, some children need therapy into the teen years or adulthood, and social anxiety can remain.
Key facts
- Assess whether and how the child tries to communicate without words at school.
- Children may appear frozen and inactive when expected to speak, and parents may assume the child is choosing not to talk.
- Many children with selective mutism had earlier speech and language problems; assess them, though they do not explain the context-dependent silence.
- Children who are unsure of a new language may be quiet while learning it; this is not selective mutism.
- Trauma can cause similar symptoms, so ask about frightening events.
Step by step
- Assess hearing, speech and language, and map where, with whom and how the child does speak.
- Explain to family and teachers that the child is not choosing silence, and involve both in the plan.
- Reinforce every communication attempt and stop speaking for the child.
- Use stimulus fading: start where the child talks, such as with a parent, and bring a new person in gradually.
- Shape speech step by step: from gestures to sounds, whispers, single words and then sentences.
- Generalize to new people, places and activities, working closely with school staff.
- Consider an SSRI when the mutism is severe or progress stalls.
A child who does not talk in some places
| Condition | Speech pattern | Key clue |
|---|---|---|
| Selective mutism | Normal speech at home, silent at school or with strangers | At least a month; anxiety-driven; not first month of school |
| Social anxiety disorder | Speaks but avoids or fears social performance | Fear of embarrassment; often co-occurs |
| Separation anxiety disorder | Distress when apart from the attachment figure | Fear centers on separation, not on speaking |
| Autism spectrum disorder | Limited or unusual speech in every setting | Social difficulties even at home; to be ruled out |
| Language disorder | Limited language in every setting | Problem is ability, not context |
| Hearing loss | Speech delayed or unclear | Abnormal audiology |
| Learning a second language | Quiet in the new language only | Fluent in the home language; temporary |
| Post-traumatic stress disorder | Mutism after a trauma | History of a frightening event; similar symptoms |
Clinical notes
- Behavioral therapy is the core treatment; for anxiety disorders in general, cognitive behavioral therapy with exposure has the strongest evidence.
- Collaborating with school staff is a vital part of treatment.
- Screen for and treat co-occurring anxiety disorders and speech or language problems.
- Follow children after improvement, because residual social phobia and other anxiety may persist and some need therapy into the teen years.
Test yourself
Think of the answer, then tap the question to see it.
Which anxiety disorder is closely linked with selective mutism?
Social anxiety disorder (social phobia); many children have it, and it can remain after the mutism improves.
Why is the first month of school excluded from the duration criterion?
The first month of school does not count, because being quiet when first starting school is not enough for the diagnosis.
What behavioral technique gradually brings a new person into a setting where the child already speaks?
Stimulus fading, usually combined with shaping and positive reinforcement.
A 7-year-old who arrived from another country six months ago speaks only her home language at home and is silent at school. Is this selective mutism?
Probably not; being quiet while unsure of a new language is not selective mutism if she speaks normally in her home language.
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Educational content on behavior and the clinical relationship; not a diagnostic or treatment guide and no substitute for assessment by a health professional. If you or someone near you is at risk, seek help now from an emergency service or a mental-health helpline.
Sources: Selective mutism (MedlinePlus Medical Encyclopedia, U.S. National Library of Medicine, 2026); Overview of Anxiety Disorders (MSD Manual Professional Edition, 2026); Selective Mutism: A Review of Etiology, Comorbidities, and Treatment (Psychiatry (Edgmont) (PubMed Central), 2010).
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