Stuttering vs Stammering: Is There a Difference?

Stuttering vs Stammering: Is There a Difference?

If you search for information about speech disfluency and find yourself reading articles that use “stuttering” and others that say “stammering,” you’re not reading about two different conditions. Stuttering and stammering are the same condition described with different terminology. The word used is largely a matter of geography.

Terminology by Region

Stuttering is the term used predominantly in the United States, Canada, and Australia. It’s the term used by the American Speech-Language-Hearing Association (ASHA), the Stuttering Foundation, and the National Stuttering Association (NSA).

Stammering is the term used predominantly in the United Kingdom and Ireland. It’s the term used by STAMMA (the British Stammering Association) and the Michael Palin Centre for Stammering in London.

Both terms describe exactly the same neurological speech condition: involuntary disruptions to the flow of speech, including sound or syllable repetitions, prolongations, and blocks. There is no clinical, neurological, or therapeutic distinction between stuttering and stammering. The International Classification of Diseases (ICD-11) and the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) both use the term “childhood-onset fluency disorder (stuttering).”

What Both Terms Describe

Whether called stuttering or stammering, the condition involves:

• Repetitions: repeating sounds, syllables, or words (“b-b-b-ball,” “I-I-I want”)
• Prolongations: extending a sound beyond its normal duration (“Sssssorry”)
• Blocks: silent pauses where the person is trying to speak but speech doesn’t emerge
• Secondary behaviours: eye blinking, head movements, or other physical reactions that develop alongside stuttering/stammering

The core neurological mechanism is the same regardless of the word used: disrupted speech motor planning and execution, with a significant genetic component.

How Common Is It?

Stuttering/stammering affects approximately 1% of the global adult population — roughly 70 million people worldwide. It’s more common in males than females (approximately 4:1 ratio in adults). Approximately 5% of children stutter at some point, with the majority recovering naturally before adulthood.

Treatment Terminology

Therapy approaches are the same regardless of the term used. Whether you search for “stuttering therapy” or “stammering therapy,” you’ll find the same evidence-based approaches:

• Fluency shaping
• Stuttering/stammering modification
• Cognitive-behavioural therapy (CBT) for associated anxiety
• The Lidcombe Programme for children

The Speechflo app supports both terminologies in its content, and the exercises are applicable regardless of which term you use. For a complete overview of causes and treatment, see our guide to what causes stuttering.

Sources

1. Craig, A., Hancock, K., Tran, Y., Craig, M., & Peters, K. (2002). Epidemiology of stuttering in the community across the entire life span. Journal of Speech, Language, and Hearing Research, 45(6), 1097–1105. https://doi.org/10.1044/1092-4388(2002/088). Accessed on June 18, 2026.
2. Yairi, E., & Ambrose, N. G. (2013). Epidemiology of stuttering: 21st century advances. Journal of Fluency Disorders, 38(2), 66–87. https://doi.org/10.1016/j.jfludis.2012.11.002. Accessed on June 18, 2026.
3. Bloodstein, O., & Bernstein Ratner, N. (2008). A handbook on stuttering (6th ed.). Delmar.