He died a natural death. Why?
1) Madara has stated before that Hashirama possesses a jutsu similar to Tsunade's Byakugou.
2) Byakugou is a forbidden jutsu because it depletes the dividing capacity of cells, which can result in premature natural death when cells are unable to divide anymore.
3) Tsunade could not sustain Byakugou all the time, needing the help of the Yin seal to use it. Hashirama however, could use it all the time (probably due to his tremendous chakra reserves) without possessing a Yin seal.
4) Not realizing that the jutsu had a lethal side effect on his lifespan, Hashirama used it constantly in battles and eventually died a natural death (when his cells stopped dividing and renewing).
THEREFORE, HASHIRAMA DIED A NATURAL DEATH.
1) Madara has stated before that Hashirama possesses a jutsu similar to Tsunade's Byakugou.
2) Byakugou is a forbidden jutsu because it depletes the dividing capacity of cells, which can result in premature natural death when cells are unable to divide anymore.
3) Tsunade could not sustain Byakugou all the time, needing the help of the Yin seal to use it. Hashirama however, could use it all the time (probably due to his tremendous chakra reserves) without possessing a Yin seal.
4) Not realizing that the jutsu had a lethal side effect on his lifespan, Hashirama used it constantly in battles and eventually died a natural death (when his cells stopped dividing and renewing).
THEREFORE, HASHIRAMA DIED A NATURAL DEATH.
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