Napoleon was still fairly young when he died: only 52.
However, he had lived a very stressful life, worked extremely
hard, slept little, and was in a bad state of health by the time
of his exile, in more ways than one. Furthermore, the sheer boredom
of his monotonous life on Saint Helena probably accelerated his
death. Other things also pressed on him: Marie Louise, who had
refused to visit him at Elba, now refused even to write him, and
he learned that she was having an affair with her guard, an Austrian
officer. Furthermore, the man who kept an eye on Napoleon, Sir
Hudson Lowe, was said to be overly harsh. Lowe sent away Las Cases,
one of Napoleon's only friends on the islands, because he suspected
that the two were plotting something. After Las Cases' exile,
Napoleon sunk into further depression. Although he had numerous
ailments by 1821, it seems likely that Napoleon's actual cause
of death was stomach cancer. (Indeed, Napoleon's stomach may have
been bothering him for years; some speculate that persistent stomach
pains may have been at the root of his habit of placing a hand
between his vest or shirt buttons, a gesture made famous in many
portraits.) Yet the defeated conqueror, who had once had nearly
all of Europe in his hands, now suffering a tedious and pathetic
exile, had also lost his will to live.