Stammering can sometimes appear alongside other neurological or genetic differences. It's also quite similar to other speech differences.
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Cluttering
Cluttering is another difference with the flow in speech. Someone who clutters might talk very fast. They might also leave off the endings of some words, or miss out or distort some syllables.
Read more about cluttering and how to help someone who clutters.
Autism
Disfluency in speech is quite common for people on the autistic spectrum.
Down's Syndrome
Stammering is also common in people with Down's Syndrome. They will often have speech and language differences and hearing loss.
Tourette's Syndrome
People who stammer might make involuntary movements when they're struggling to speak. It can often be difficult to distinguish this from tics disorders associated with Tourette Syndrome.