There are natural oral speech disorders such as sluttering, cluttering, articulation disorders, and aplaxia. Sluttering is a problem that interferes with fluent speech. When someone repeats the first part of a word or stays a long time on a single sound it is because they are slutter. A person who stutters has trouble getting out what they want to say, and a person who clutters says what they are thinking, but it becomes disorganized while actually speaking. Apraxia is thought to be due to a brain impairment that may or may not show up on brain magnetic resonance imaging tests.
The ability to understand language and produce speech is coordinated by the brain. So a person with brain damage from an accident, stroke, or birth defect may have speech and language problems. Genetics may also play a role in some speech problems. Articulation disorders is for example confusing or substituting the W and the R like many “campesinos” here in Colombia, it also includes adding sounds to words, and omitting sounds. Finally, the last disease is lisping, which refers to specific substitution involving the letters S and Z. A person with lisping replaces the S and Z sounds with TH.
On the other hand, many people cannot speak in public, but this is for personal reasons. Millions of people around the world suffer from stage fright or performance anxiety. Performance anxiety prevents you from explaining thoughts and expressing emotion. Performance anxiety can affect you mentally in the long term since it can affect your self-esteem and confidence in a negative way. The reaction of stage fright is very common on the human body and it serves many different purposes. When you are being watched by hundreds of people you will feel stress. When you are in stress your body releases little dosage of adrenaline, which causes you to panic. This system is a very well known defense of the body when it is in danger. The mechanism used is called fight or flight. There are