The exact cause of stuttering is still not fully understood. However, for developmental stuttering, possible causes include:
- Abnormalities in the brain region responsible for motor speech movements
- Genetics - stuttering tends to run in families
The causes of acquired stuttering include:
- Stroke
- Traumatic brain injury
- Other brain disorders
Factors that worsen stuttering symptoms include:
- When one is excited
- When one is tired
- When under time pressure
Risk factors for developing stuttering include:
- Delayed childhood development
- Having relatives, specifically males, who stutter
- Stress
- Emotional trauma