Cleaning and catering workers at Great Western hospital in Swindon struck for five days from Thursday of last week.
The workers, members of the GMB union, are angry at a culture of bullying, corruption and racism at Carillion, the contractor that employs them.
Many of the women have been employed there for seven to ten years and say things have changed for the worse in the past year.
One worker said, “Our hours had been cut and holidays curtailed but we are determined to win.”
The latest strike is an escalation of their action.
The workers plan to walk out for a further seven days from Saturday of this week.
Protests have been organised by GMB outside other Carillion sites in the region, including the new Southmead hospital being built in Bristol.
Assemble 11.15am at Salisbury Street, Swindon SN1 2AN on Saturday 17 March for march to 1pm rally at Canal Wharf, Swindon SN1 5PL