Rab fainted upon seeing Woking cough up blood. (AUDIO: Seed of Chaos)
Ian Chesterton and Barbara Wright fainted during their first flight aboard the Doctor's TARDIS, (TV: An Unearthly Child) something that the Twelfth Doctor later attributed to his first self's poor piloting skills. (PROSE: Twice Upon a Time)
When the Doctor's TARDIS crashed into the office of Adolf Hitler, the Teselecta simulated a faint to avoid suspicion, one that the Eleventh Doctor suspiciously observed as "perfect". (TV: Let's Kill Hitler)
After seeing the War Doctor in the Doctor's time stream, Clara Oswald fainted from exhaustion. (TV: The Name of the Doctor)