It wasn't the author who was mad but the main-character.
No direct answer to this was given in the story so all answers can only be a matter of speculation. However, the main-character shows many of the symptoms of Mercury poisoning.
The main character is quite possibly driven crazy by the very act of the murder he perpetrated.
Peter West has written: 'The telltale heart'
Other than the title, The Telltale Head being a play on The Telltale Heart the similarities lie in The Telltale Heart having the narrator, who is presumably the murderer, being haunted by the sound of the victim's beating heart. Bart, who is also the narrator of The Telltale Head briefly, is haunted by the voice of Jebidiah Springfield.
Treasury Men in Action - 1950 The Case of the Telltale Heart 4-5 was released on: USA: 24 September 1953
are you mad!!
Rude Awakening - 1998 Telltale Heart 3-13 was released on: USA: 14 September 2000 France: 5 May 2002 Hungary: 11 January 2009
Gerald Butler has written: 'Blow hot, blow cold' 'Mad with much heart' 'Dark rainbow'
Ethel Johnson has written: 'Telltale trees' -- subject(s): Tree test
The Telltale Clue was created in 1954.
Telltale Games's population is 90.
the real cause of heart burn is acid in the tummy and burns like the mad
The duration of The Telltale Clue is 1800.0 seconds.
Telltale Games was created in 2004-06.