what did you think about social anxiety disorder?
I dont know much about social anxiety disorder. 
It means a fear about social situation, which cause distress and makes us unable to function.
Can people get help for social anxiety disorder?
Yes, they can. But, it involves more social inhibition.
Can they get professional help?
Distressed personality type
Distressed personality type, or "type D" individuals, tend to suppress powerful negative emotions as a means of coping with stressful events or situations. These individuals suppress feelings of anger or sorrow even when they are in an environment that is supportive of emotional expression, such as suppressing anger when clearly justified, or refusing to cry at a funeral. The type D individual tends to be anxious, irritable, insecure, and uncomfortable with strangers. These types of people are constantly experiencing and anticipating negative emotions,
Anxiety disorders Social anxiety disorder.
Social anxiety disorder is an anxiety disorder consisting of overwhelming anxiety and excessive self-consciousness in everyday social situations. It is an extreme fear of being scrutinized and judged by others in social and/or performance situations. This fear about a situation can become so severe that it affects work, school, and other typical activities. Social anxiety can be related to one situation (such as talking to people) or it can be much more broad, where a person experiences anxiety around everyone except family members.