Neurodevelopmental Condition

Stammering (stuttering)

Stammering (also called stuttering) is a speech fluency disorder affecting around 1% of adults, characterised by repetitions, prolongations and blocks that disrupt the flow of speech. Far beyond the physical disruption, stammering often generates significant anxiety, avoidance and identity challenges. Specialist speech and language therapy and psychological approaches both produce meaningful improvement in fluency, confidence and quality of life.

See therapies that may help

What is Stammering (stuttering)?

Stammering involves disruptions to the normal flow of speech — including sound, syllable or word repetitions ("b-b-but"), prolongations ("ssssun"), and blocks (silent moments where speech is momentarily stuck). Secondary behaviours — eye blinks, head movements, loss of eye contact — often develop as strategies to release the stammer.

Around 5% of children stammer, but most recover spontaneously. Persistent developmental stammering in adults affects around 1% of the population, more commonly men than women. There is a strong genetic component. The physical stammer is the surface feature — the significant psychological dimensions of stammering, including anticipatory anxiety, avoidance of words and situations, and impact on identity, are often more disabling than the stammer itself.

Signs and symptoms

Stammering presentations may include:

Repetitions, prolongations or blocks in speech
Secondary behaviours — physical movements used to release stammers
Avoidance of specific feared words or sounds, substituting easier alternatives
Avoidance of speaking situations — phone calls, presentations, meeting new people
Significant anxiety before and during speaking situations
Impact on career, relationships or daily activities due to stammering
Significant distress, shame or reduced self-confidence related to stammering

How therapy can help

Effective approaches for stammering address both the physical and psychological dimensions:

Specialist SLT for stammering — fluency shaping approaches (teaching new speech patterns) and stammering modification approaches (changing how the stammer is produced rather than eliminating it); the most evidence-based physical approaches
Acceptance and commitment therapy (ACT) — building psychological flexibility and willingness to communicate in the presence of stammering; reducing avoidance and building values-based communication behaviour
CBT — addressing the anxiety, avoidance and negative beliefs about stammering that are often more limiting than the stammer itself
Intensive group programmes — combining SLT and psychological approaches in an intensive format; high motivation and peer support produce significant outcomes
Self-help and peer support — stammering organisations and self-help groups provide community, acceptance and shared strategies

Seeking help

The British Stammering Association (stamma.org) provides resources, a helpline, therapist directory and peer support. Michael Palin Centre for Stammering in London is the UK's leading specialist centre for children and adults. NHS SLT services accept stammering referrals; waiting times vary. Many people who stammer find peer connection with other people who stammer as valuable as clinical treatment.

Therapies that may help with Stammering (stuttering)

Therapy	Evidence	Notes
Speech Therapist	strong	Core SLT area; focus on fluency, confidence and communication goals.
Cognitive Behavioural Therapist	strong	CBT for stammering psychological component.
Counsellor	strong	Core use for stammering psychological component.
Psychotherapist	strong	Core use for stammering psychological component.
Arts Therapist	moderate	Arts therapy for stammering confidence.
EMDR Practitioner	moderate	EMDR for stammering trauma component.
Hypnotherapist	moderate	Used for stammering alongside speech therapy.
Mindfulness Practitioner	moderate	Mindfulness for stammering anxiety.

Frequently asked questions

Can adults be cured of stammering?

Most specialist stammering clinicians have moved away from the concept of 'cure' towards 'living well with stammering'. While many adults achieve significant improvements in fluency, the goal is typically a life where stammering does not limit what you do or feel. For many people, the greatest change comes from the psychological work — reducing avoidance and building confidence — rather than fluency itself.

Is stammering caused by anxiety?

No — stammering is neurological in origin, not caused by anxiety. However, anxiety is a very significant maintaining and exacerbating factor. The stammer causes anxiety; anxiety worsens the stammer. Most adults who stammer experience significant anticipatory anxiety about speaking situations. Addressing the anxiety component alongside the physical stammer is essential for comprehensive treatment.

What is the difference between fluency shaping and stammering modification?

Fluency shaping approaches teach new speech patterns (controlled fluency) using techniques such as slowing speech rate and smooth transitions between sounds. Stammering modification approaches aim to change how the stammer is produced — making it easier and less tense — rather than eliminating it. Most specialist SLTs use integrated approaches combining elements of both.

Can children grow out of stammering?

Yes — around 75–80% of children who stammer recover spontaneously, typically before age 6. Recovery is more likely in girls and when there is no family history of persistent stammering. Specialist SLT assessment can assess recovery likelihood and support early intervention where indicated. Early therapy improves outcomes.

Does stammering affect career prospects?

Stammering can affect career choices and progression when avoidance leads people to self-select away from roles involving communication. However, many highly successful professionals stammer. Therapeutic work reducing avoidance and building communication confidence significantly expands career options. Stammering is also a protected characteristic under the Equality Act 2010, requiring employers to make reasonable adjustments.