by Anna Scanlon, Natural Society:
A new Danish study has found that people who have been hospitalized for a serious infection are at a higher risk for suicide. Researchers think that perhaps it has to do with the inflammation in the brain as a result of the infection, though there a few possibilities.
The study examined the Danish national registry, combing through records of 7.2 million people from 1980 to 2011. Using this information, it was found that those who had been hospitalized for infections had a 42% increased risk for death by suicide compared to those who were hospitalized for other reasons. 
However, this study doesn’t demonstrate a cause and effect, but researchers already know that inflammation can cause depressive symptoms. The researchers even found that 1 in 10 suicides might be linked to infections.
The results, which were published in JAMA Psychiatry, might give weight to the theory that depression is a disease rooted in inflammation. This theory has been proposed by several smaller studies, and this larger study strengthens the theory.
In fact, a 2015 study published in the Annals of Gastroenterology found that of those who were given medication that prompted brain inflammation, one third to one half of them developed symptoms of major depression. 
However, it is important to note that the majority of people who have died by suicide do not have a history of inflammatory infections. Likewise, most people with inflammatory infections do not die by suicide.
“The numbers indicating an increased risk for suicide after severe infections are high, perhaps surprisingly high even for us working with this subject,” said Lena Brundin neurobiologist at the Van Andel Research Institute and Michigan State University who was not involved in the study.
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