Teachers in Aberdeen have told BBC News they are traumatised, fear for their safety and are scared to go to to work because of escalating pupil violence.
One teacher said she had recurring nightmares after being attacked, with another describing her school as "completely lawless".
The EIS union is calling for urgent intervention by Aberdeen City Council.
The council said it was trying to support staff while also addressing underlying causes of misbehaviour.
An EIS survey of nearly 800 members in the city found almost half reported violent pupil behaviour in school every day, and more than a third said they had been physically assaulted.
Three teachers agreed to speak to BBC Scotland News anonymously about their experience.
An additional support needs teacher said one incident had left her with concussion, while on another occasion she was pushed and fell backwards.
"Even when I'm in my bed, I'll be thinking about what happened, or what might happen tomorrow," she said.
"I'm still having nightmares after an incident - and that's an ongoing thing. It takes over your life."
A secondary school teacher said the situation at her school was the worst she had seen in her 20-year career.
"There are pupils that just refuse point blank to do what you're asking," she said.
"They'll swear at you, often they will square up to you."
She believes it is only a "matter of time" before something even worse happens.
"I wonder - do they have a weapon? Are they going to just kick out and assault me," she said.
"For the first time in my career, I'm scared in my workplace."
