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But Lifeline would not confirm whether calls to its service about the plebiscite had increased.

"Lifeline routinely records data about issues faced by communities be they natural disasters or key social issues," a spokesperson said.

"As we only have begun to collect this data there is no trend to report in calls relating to the marriage plebiscite."

Other categories recently added to the Lifeline system relate to the dairy farmers' crisis, the NSW greyhound ban and the royal commission into child sexual abuse.

Lifeline volunteers are given specific training to deal with issues relating to each of these events.