Social anxiety can be defined as nervousness. Its really a source of concern 
Have you ever experienced it? It is really scary.
characterized by a significant amount of fear in one or more social situations, causing considerable distress and impaired ability 
I see, what are the symptoms?
Basic symptoms of schizophrenia
Basic symptoms of schizophrenia are subjective symptoms, described as experienced from a person's perspective, which show evidence of underlying psychopathology. Basic symptoms have generally been applied to the assessment of people who may be at risk to develop psychosis. Though basic symptoms are often disturbing for the person, problems generally do not become evident to others until the person is no longer able to cope with their basic symptoms. Basic symptoms are more specific to identifying people who exhibit signs of prodromal psychosis (prodrome) and are
Social anxiety disorder
Social anxiety disorder (SAD), also known as social phobia, is an anxiety disorder characterized by a significant amount of fear in one or more social situations, causing considerable distress and impaired ability to function in at least some parts of daily life. These fears can be triggered by perceived or actual scrutiny from others. Individuals with social anxiety disorder fear negative evaluation from other people.
Physical symptoms often include excessive blushing, excess sweating, trembling, palpitations, and nausea. Stammering may be present,