Agoraphobia

Agoraphobia was a psychological condition. The sufferer was afraid of open spaces and the outside, sometimes to the point where he could not leave his own home. Ethan Amberglass identified the phobia with fear of trains. Although he denied being agoraphobic, he did admit to not "lik[ing] being in crowds". (PROSE: The Algebra of Ice)

Kosi was agoraphobic, according to Ace "happier with four blank walls around [her]" than in the open, but wondrous, places around her like the Moloch Base. Kosi could not stand the lack of factories and living towers. (PROSE: Lucifer Rising) Agoraphobe Cristián Alvarez found himself unable to work or shop. (PROSE: The Left-Handed Hummingbird) When Ed Morgan was submitted to an insane asylum, he was diagnosed agoraphobic. This was mainly due to guilt and fear after raping and murdering Lizzie Lewis in 1963. (TV: Ghost Machine)

Having found a metal bug in Martin Chisom's forcing shed, the Third Doctor described its species as "agoraphobic micro-aliens from a compact dimension". The bug displayed a desire to reside permanently within the shed, in line with this condition. (AUDIO: Lost in the Wakefield Triangle)

According to Bernice Summerfield, one girl suffering from the condition committed suicide within 24 hours of getting locked in the Glass Prison — she "couldn't bear the lack of comforting non-see-through walls". (PROSE: The Glass Prison)

Samantha Jones felt "the first twinges" of agoraphobia when in Hyspero, a planet with deserts and seas that seemed to go on forever. (PROSE: The Scarlet Empress)

Alistair Gryffen began suffering from agoraphobia after he lost his wife and children. (TV: The Fall of the House of Gryffen) He finally overcame his fear to shut down the Space-Time Manipulator. (TV: The Eclipse of the Korven)

As Lucas Seyton perhaps joked, organisations like "Agoraphobics Anonymous" existed in 1933 London. (PROSE: Fallen Angel)