Rachel Riley has said the stress of hate messages from online trolls stopped her unborn baby kicking in the womb.
The pregnant Countdown star has been a vocal critic on Twitter of the Labour Party and leader Jeremy Corbyn over the anti-Semitism row that has engulfed the party.
Rachel said the online abuse she received intensified in July after she endorsed a BBC Panorama documentary on the topic.
The TV personality has since blocked trolls for the wellbeing of her first baby, who she is expecting with husband Pasha Kovalev - a former Strictly star.
The mathematician said 'it's not worth the hormones.'
Speaking on the Trolled podcast with EastEnders actress Tracy-Ann Oberman, Rachel said: "I was very stressed and upset for a couple of days and my baby stopped wriggling for a couple of days.
"So at that point, it's like, 'You know what, nah'. It's not worth the hormones.
"I've now changed most of my Twitter settings as you don't need to see them.
"They're not after proper debate. They're not after their minds changing. They're not doing it for virtuous reasons, so I block them."
The 33-year-old announced she was pregnant to her followers in May with a special placing of vowels and consonants on the Countdown board.
"Being pregnant has highlighted that for me: I don't need this", she said.
Riley speaking about the stress over online trolls follows her decision to join other high-profile celebrities in a campaign to silence them on social media.
She's accompanied by Gary Lineker, Dragons' Den star Deborah Meaden, and Pointless quiz show host Richard Osman among others.
Those in the public eye changing their approach to negative comments on social media is to target those using it as a platform to spread racist, sexist, xenophobic and other hateful messaging through retweets and public shaming.
The move also comes after singer Jesy Nelson opened up about her suicidal thoughts in a BBC documentary after being trolled on social media over her looks.
New research suggesting hate speech is being inadvertently spread through social media when insults, put-downs or worse are quoted or shared has convinced the celebrities to change their approach.
While the worst abuse will be sent to police, lesser examples will be sent to social media giants such as Twitter and Facebook to put pressure on them to act.
Riley, an Oxford maths graduate, rose to fame after replacing Carol Vorderman on Countdown in 2009.
