Recent research has also indicated that another area of the brain, the anterior cingulate cortex, which was already known to be involved in the experience of physical pain, also appears to be involved in the experience of social pain, for example perceiving group exclusion. Recent research also highlighted the potent role of the prefrontal cortex, especially its dorsolateral part, in the maintenance of cognitive biases involved in SAD. A 2007 meta-analysis also found that individuals with social anxiety had  hyperactivation in the amygdala and insula areas which are frequently associated with fear and negative emotional processing. Diagnosis
ICD-10 defines social phobia as fear of scrutiny by other people leading to avoidance of social situations. The anxiety symptoms may present as a complaint of blushing, hand tremor, nausea, or urgency of micturition. Symptoms may progress to panic attacks.Standardized rating scales such as the Social Phobia Inventory, the SPAI-B, Liebowitz Social Anxiety Scale, and the Social Interaction Anxiety Scale can be used to screen for social anxiety disorder and measure the severity of anxiety. DSM-V Diagnosis
DSM-5 defines Social Anxiety Disorder as a marked, or intense, fear or anxiety of social situations in which the individual may be scrutinized by others.DSM-5 Diagnostic Criteria with Diagnostic Features:

Marked fear or anxiety about one or more social situations in which the individual is exposed to possible scrutiny by others. Examples include social interactions (e.g., having a conversation, meeting unfamiliar people), being observed (e.g., eating or drinking), and performing in front of others (e.g., giving a speech).
Social anxiety disorder occurs more often in females than males. The prevalence of social phobia appears to be increasing among white, married, and well-educated individuals. As a group, those with generalized social phobia are less likely to graduate from high school and are more likely to rely on government financial assistance or have poverty-level salaries. Surveys carried out in 2002 show the youth of England, Scotland, and Wales have a prevalence rate of 0.4 percent, 1.8 percent, and 0.6 percent, respectively. In Canada, the prevalence of self-reported social anxiety for Nova Scotians older than 14 years was 4.2 percent in June 2004 with women (4.6 percent) reporting more than men (3.8 percent). In Australia, social phobia is the 8th and 5th leading disease or illness for males and females between 15 and 24 years of age as of 2003. Because of the difficulty in separating social phobia from poor social skills or shyness, some studies have a large range of prevalence. The table also shows higher prevalence in Sweden. Terminology
It has also been referred to as anthropophobia, meaning "fear of humans", from Greek: άνθρωπος, ánthropos, "human" and φόβος, phóbos, "fear". Other names have included interpersonal relation phobia. A specific Japanese cultural form is known as taijin kyofusho. See also
Alexithymia
Agoraphobia
Asociality
Highly sensitive person
Impostor syndrome
Obsessive-compulsive disorder
Phobia
Scopophobia
Selective mutism
Social inhibition
Social rejection

References
Further reading
Belzer K. D.; McKee M. B.; Liebowitz M. R. (2005). "Social Anxiety Disorder: Current Perspectives on Diagnosis and Treatment". Primary Psychiatry. 12 (11): 40–53. Archived from the original on 2012-05-12. Retrieved 2006-06-21. Beidel, D. C., & Turner, S. M. (2007).