Phobia

Lesterson observed that an examiner, actually the Second Doctor had a phobia regarding the Daleks. (TV: The Power of the Daleks)

Named phobias
Agoraphobia was the fear of open spaces and the outside. (PROSE: The Algebra of Ice)

Ailurophobia was the fear of felines. (AUDIO: Nevermore)

Anachrophobia was a fear of temporal displacement. (PROSE: Anachrophobia)

Aphenphosmphobia was the fear of physical contact. (PROSE: The Tunnel at the End of the Light)

Aquaphobia was the fear of water. (AUDIO: House of Blue Fire)

Arachnophobia was the fear of spiders. (PROSE: The Scarlet Empress)

Athazagoraphobia was the fear of being forgotten or ignored. (AUDIO: House of Blue Fire)

Blattodephobia was the fear of cockroaches. (AUDIO: House of Blue Fire)

Catoptrophobia was the fear of mirrors, of seeing one's reflection. (AUDIO: House of Blue Fire)

Chocophobia was the fear of chocolate. (AUDIO: Memory Lane)

Claustrophobia was the fear of enclosed spaces. (TV: Detained)

Coulrophobia was the fear of clowns. (TV: The Day of the Clown)

Haemophobia was the fear of blood. (TV: The Girl Who Died)

Pantophobia was the fear of everything. (TV: Night Terrors)

Technophobia was the fear of advanced technology. (AUDIO: Technophobia)

Teleportaphobia was a fear of of near-instant transport methods such as teleportation, transmat and T-Mat. (PROSE: Down)

Triskaidekaphobia was a fear of the number 13. (COMIC: A Confusion of Angels)

Xenophobia was, as Ian Chesterton put it, a "dislike for the unlike". (TV: "The Ambush") Cymrophobia was a form of xenophobia against Welsh people. (AUDIO: Superiority Complex)

Unnamed phobias
Bradley was "darkness-phobic" and had a note to prove it. (TV: In the Forest of the Night)

Larles had a phobia of squirrels, which she did not name. (PROSE: Ring Theory)