“社恐”可以译作social phobia或social anxiety disorder (SAD）。

phobia /ˈfəʊbiə/的意思是“恐惧症”。

例句：

He has a phobia about flying.

他对飞行有恐惧症。

Social phobia is the third largest psychological problem in the world today.

社交恐惧症是当今世界第三大精神疾病。

Social phobia can make being with others a nightmare.

社交恐惧症让身处人群成为一种恶梦。