What causes stuttering?

COLIN FIRTH & GEOFFREY RUSH THE KING'S SPEECH (2010)

Stuttering, or stammering, is a disorder that can affect the flow and fluency of our speech. Common symptoms are the repetition of sounds, words or phrases – sometimes accompanied by rapid eye blinking and other facial tics. Although many young children stutter, only one per cent of adults have the disorder, and men are four times as likely as women to stutter. Speech language pathologists apply behavioural therapies to help stutterers slow their speech and breathing patterns to suppress the tics, although certain situations tend to aggravate the symptoms. When speaking with someone who stutters, don’t attempt to finish their sentences – just be patient and calm.

Answerd by Dave Roos