A stutter normally starts for people in childhood and is often referred to as a childhood stutter. This is often very worrying for parents and the child and it is difficult to know where to seek help for the person who has the stutter.
There are many types of stutter. Family and friends may not even be aware that a person they know has a stutter. That is because the person is able to hide the stutter, by using word avoidance or word substitution.
Other people are unable to do this and have what they would consider an openely more severe stutter.
A stutter would normally occur more when a person is:
meeting new people
speaking in an uncomfortable situation
asking questions, for example asking for directions
Stuttering can also be known in some areas as stammering.
People who have a stutter have different options when seeking therapy. They can go to a speech therapist or speech pathologist. Alternatively they can attend a speech course. These courses can be on a group basis or on a one to one basis.
I personally prefer and advise one to one stutter courses as I believe every person who has a stutter is an individual and has their own individual type stutter.