One female staff member taking part in the legal action, who did not wish to be named, told the BBC she and her colleagues had been “poisoned”.
The way they were treated was a “massive kick in the teeth” and it had caused widespread anger, she said.
“A lot of people were suffering from chronic fatigue, constant headaches, low vitamin B12, which was subsequently causing things like heart palpitations and very foggy heads,” she said.
They were seeking “justice for the staff” who “work tirelessly” to safely deliver babies, she added.
“You’ve got people sitting in offices that need to be held accountable for their actions,” she said.
In another case, a midwife said she had collapsed at work due to the symptoms, which included headaches, low mood and anxiety.
Another claimant said she had experienced pain in her hands and feet.
Other symptoms listed in the court filing include “excessive fatigue and irritability”.
The women are seeking damages for personal injury in excess of £1,500.