TV host Charlotte Dawson is in hospital after hundreds of social media trolls viciously targeted her on Twitter overnight.

A spokeswoman for Dawson's management said today: "She is in hospital and she is OK."

A St Vincent's Hospital spokesman said 46-year-old Dawson was in the hospital in Sydney's Darlinghurst and was expected to make a "full recovery".

"She has asked that her privacy be respected," he said. "She is sitting up in bed and she's in good hands."

A close friend of Dawson, who was with her today, also said: "Charlotte's with doctors."

Police said they were called to an inner city Sydney residence early today. An ambulance spokesman said they also responded to a call to help a woman at 3.05am.

Twitter troll suspended from job after Dawson intervenes

Dawson appeared on the Nine Network's A Current Affair and Ten Network's The Project last night to expose vitriolic Twitter bullying this week, with many followers calling for the celebrity to "please go hang yourself."

The social media war started after Dawson tracked down one alleged Twitter hater, Tanya Heti, who has since been suspended from her mentoring job at Melbourne's Monash University after Dawson reported her abusive tweets to the university.

After Dawson's TV appearances last night, hundreds of tweeters took aim at her.

Camera Icon TV personality Charlotte Dawson in Sydney. Credit: The Daily Telegraph, Craig Greenhill

In more than 100 messages of abuse, which Dawson re-tweeted on her own page, followers told the celebrity to "neck yourself you filthy s***" and "please put your face in a toaster".

During the abuse some offenders sent images of dead bodies covered in blood and told Dawson to "please hang yourself promptly."

Followers also attacked the former model's appearance and personal life.

"It's a very good thing that you cannot breed," one poster wrote.

"How the f**** did you become a model."

Shortly after 2am today Dawson posted on Twitter "Hope this ends the misery" and "You win x."

Today the online community expressed concern over the treatment of Dawson after her final Twitter post at 2.07am.

"This is important, Charlotte Dawson has been bullied all nite (sic)," said one concerned follower Ms.M aka Kerry.

Readers seeking support and information about suicide prevention can contact Lifeline - 13 11 14 and www.lifeline.org.au, Suicide Call Back Service - 1300 659 467 and Suicide Line (Victoria only) - 1300 651 251