Suffers from panic attacks, social phobia, and stage fright
Background on her conditions.
The most famous singer in the world in 2011 and 2012 appears to have suffered from not only panic attacks, but also social phobia and severe stage fright. Performing in front of crowds of thousands can give anyone stage fright, but there is a strong likelihood the her anxiety attacks were and issue long before she ever stepped on stage.
Adele now refuses to perform in front of large crowds and or arenas. She also has attacks when meeting idols such as; Beyoncé.