People coming in contact with ones displaying self-destructive behaviour are more likely to show a suicidal tendency.
It is common among vulnerable people - especially teens and young adults. This is called "suicide contagion."
Contagion includes indirect as well as direct exposure to suicide, as Health and Human Services explains. Reading a newspaper article about a famous suicide and not just directly experiencing the death of a friend or an attempt made by a family member might propel someone who is at-risk to follow suit.
As well as the increased risk of suicide attempt, those bereaved by suicide were also 80 per cent more likely to drop out of education or work.
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In total, 8 per cent of the people bereaved by suicide had dropped out of an educational course or a job since the death.
"Our results highlight the profound impact that suicide might have on friends and family members," said study author Alexandra Pitman from UCL.
"We know that people can find it difficult to know what to say to someone who has recently been bereaved. However, saying something is often better than saying nothing, and simple gestures like offering practical help with day-to-day activities can mean a lot.
The study also found that people who had been bereaved by suicide tended to perceive more social stigma around the death.
When the results were adjusted for perceived social stigma to reflect this, the significant differences in suicide attempts and occupational functioning disappeared.
"People bereaved by suicide should not be made to feel in any way responsible, and should be treated with the same compassion as people bereaved by any other cause," said Pitman.
"Suicide is a complex issue and there is often no simple explanation for why someone chooses to take their own life," Pitman said.
"Although one often hears people refer to a relationship break-up or a redundancy as the trigger for a suicide, this is far too simplistic and in reality it is often a culmination of different life events rather than one individual 'cause'," she said.
However, the new study suggests that a history of suicide among non-blood relatives and friends should also be considered when assessing suicide risk.
The study was published in the journal BMJ Open.