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Each regeneration occurs because of something, like radiation poisoning from the 3rd to the 4th and 10th to the 11th ... or old age as to 11 to new cycle.

But, what are the causes of his "death" ? What are the reasons behind each regeneration?

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This question appears to be off-topic because it is about information easily found on a reference site. meta.scifi.stackexchange.com/questions/4705/… –  BBlake Jun 13 at 18:27

1 Answer 1

up vote 12 down vote accepted

If I understand what you are asking, this Doctor Who Wiki page will answer your question.

The relevant bit here:

  • First: Claimed to be "wearing a bit thin"; apparently died of simple old age, but other accounts suggest he also had his waning life force pulled out of him by the planet Mondas.
  • Second: Forced to change his appearance by Time Lord court order, and eventually executed by animated scarecrows. Sentence passed in The War Games, carried out in The Night Walkers
  • Third: Radiation poisoning upon exposure to The Great One's highly unstable web of Metebelis crystals.
  • Fourth: Fell to the ground from great height at the Pharos Project; indirectly caused by the Master.
  • Fifth: Refusal to take antidote for spectrox toxaemia in order to give it instead to Peri Brown, succumbing to the fatal effects of the poisoning.
  • Sixth: Ambiguous injury consequent to the Rani's attack on the TARDIS. Some accounts indicated the Doctor hit his head on the TARDIS console. Others suggest that he was also suffering from a chronal energy drain after his confrontation with the Lamprey and this served as the killing blow.
  • Seventh: Following a non-fatal shooting, the Seventh Doctor underwent open heart surgery in a San Francisco hospital. Since the attending cardiologist had no knowledge of Time Lord physiology, she accidentally killed him.
  • Eight: Died after a ship he was in crash-landed on Karn; temporarily resurrected to consume the Sisterhood of Karn's Elixir of Life and control his next regeneration for the Last Great Time War.
  • Ninth [The 'War' Doctor]: As with the First Doctor, he claimed to be "wearing a bit thin" and regenerated from what appeared to simply be old age.
  • Tenth (Commonly called Ninth): Directly absorbed time vortex energy from the Bad Wolf to save the life of Rose Tyler.
  • Eleventh (Commonly called Tenth)1: Shot by a Dalek, but routed excess regeneration energy into his own previously severed hand, resulting in no physical change, but using up a regeneration to survive the lethal attack. This 'spare' regeneration energy used to create the Meta-Crisis Doctor from the severed hand with help from Donna Noble.
  • Twelfth (Commonly still called Tenth, but technically a new version with the same face): Intentional radiation poisoning incurred in order to save the life of Wilfred Mott.
  • Thirteenth (Commonly called Eleventh): As with the First and War Doctors, his body succumbed to old age, but by a far greater amount than either of them. This marked the beginning of a new regeneration cycle granted by the Time Lords.

1 -11th Doctor's details added by me; not listed on the linked page.

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just because it confused me the way it was written here (since the chronology gets whacky), the "Tenth" Doctor (Tennant) died twice... once to create the meta-crisis doctor, and once to save Wilfred. As far as we know, the meta-crisis Doctor himself is still alive (though he's part human and will grow old and die naturally) –  Michael Edenfield Jun 13 at 0:28
    
Updated it (and reversed two of 'em) to clarify that. –  KHW Jun 13 at 0:49
    
Great answer ... I wonder if the "max age" to "die" increases after each regeneration. –  Michel Jun 13 at 2:27

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