Can an extravert suffer from social anxiety disorder? Extraversion is a personality trait that, as the Wikipedia article describes, causes people "to enjoy human interactions", to be sociable, outgoing and love crowds.

Social anxiety disorder (SAD), on the other hand, causes people to fear being judged and often makes them avoid social situations, either in general or at least those aspects that would lead to the person to "stand in the spotlight".

From their definitions, extraversion and SAD seem to exclude each other. It seems impossible that they can co-occur in the same person.

Is it possible that an extraverted person suffers from social anxiety disorder?
It's pretty difficult to imagine a person with Social Anxiety Disorder being an extrovert.  The symptoms of SAD include [1]:


  
  Intense fear of interacting with strangers and of being judged
  Worrying about embarrassing or humiliating yourself or that others think that you look anxious
  Anxiety that disrupts your daily routine, work, school or other activities
  Avoiding doing things or speaking to people out of fear of embarrassment
  Avoiding situations where you might be the center of attention
  Difficulty making eye contact or talking
  


Signs and symptoms include blushing, sweating, trembling or shaking, fast heartbeat, upset stomach, nausea, shaky voice, muscle tension, confusion, diarrhea, and cold, clammy hands.

Extroverts, on the other hand, usually don't have any problems with the above situations.

Introversion and extroversion are not either/or, but exist on a continuum. One can have attributes of both, and empathy with both. SAD is not on this continuum.

[1] Mayo Clinic