Injury

An injury was damage to the body caused by external force.

An injury could be the cause of regeneration. (TV: Logopolis, Time and the Rani, Doctor Who, Utopia, Let's Kill Hitler, Hell Bent, The Doctor Falls, Twice Upon a Time, PROSE: Interference - Book Two)

When the Twelfth Doctor broke his toe, Clara Oswald suggested that he regenerate to heal the injury, but he berated the idea as a waste. (PROSE: The Blood Cell)