Lots of people suffer from an anxiety disorder called social phobia.
I have heard of that. Is it when they are afraid of social situations?
Yes and being in social situations can cause excessive blushing, sweating, trembling, and nausea.
I see. How is the disorder treated? Medication or perhaps psychotherapy?
Some sufferers self-medicate leading to alcoholism, eating disorders or drug abuse.
That's unfortunate. I guess it is painful for them to endure.
It is sometimes referred to as an "illness of lost opportunities"