Some fields of study, such as sociology, psychiatry and graphology, have investigated the reasons why people who complete or attempt suicide leave a note.
The most common reasons that people contemplating suicide choose to write a suicide note include one or more of the following:2
Sometimes there is also a message in the case of murder–suicide, explaining the reason(s) for the murder(s); see, for example, Marc Lépine's suicide statement and videotaped statements of the 7 July 2005 London bombers.
SHIOIRI, TOSHIKI; NISHIMURA, AKIYOSHI; AKAZAWA, KOHEI; ABE, RYO; NUSHIDA, HIDEYUKI; UENO, YASUHIRO; KOJIKA-MARUYAMA, MAKI; SOMEYA, TOSHIYUKI (April 2005). "Incidence of note-leaving remains constant despite increasing suicide rates". Psychiatry and Clinical Neurosciences. 59 (2): 226–228. doi:10.1111/j.1440-1819.2005.01364.x. PMID 15823174. S2CID 28986718. https://doi.org/10.1111%2Fj.1440-1819.2005.01364.x ↩
Olson, Lenora (2005). The Use of Suicide Notes as an Aid for Understanding Motive in Completed Suicides (Thesis). University of Utah. ↩
"Suicide note reveals murder confession". London: bbc.co.uk. 1971-07-14. Retrieved 2008-10-28. http://news.bbc.co.uk/onthisday/hi/dates/stories/july/14/newsid_2503000/2503395.stm ↩
"Man jailed for murder in lay-by". London: bbc.co.uk. 2008-03-01. Retrieved 2008-10-28. http://news.bbc.co.uk/1/hi/england/lincolnshire/4762774.stm ↩
"Suicide note found in murder-suicide case". cbc.ca. 2000-06-23. Archived from the original on December 19, 2008. Retrieved 2008-10-28. https://www.cbc.ca/news/canada/suicide-note-found-in-murder-suicide-case-1.234301 ↩