Originally Posted by JAS84:
“1>2: Exhaustion and old age
2>3: Forced
3>4: Radioactivity
4>5: Severe injuries from a fall while foiling one of the Master's schemes
5>6: Poisoned
6>7: TARDIS crash landing due to attack by the Rani
7>8: Died on the operating table after getting shot
8>9: Crippled in the attack which destroyed the Time Lords and Daleks
9>10: Absorbed time energy
10>11: Radioactivity
”
Technically the scenario of the regeneration from 4 - 5 could also be added to the 10-11 regeneration. The fall
of The 10th Doctor in his final episode was from much higher up with a much harder landing. The 4th Doctor
fell several hundred feet and landed in a field, while The 10th Doctor fell from a few thousand feet, smashed
through a huge glass dome, and landed on a solid marble floor with quite a thud!