The swimming pools at Blaydon and Dunston Leisure Centres have been temporarily closed for a deep clean of the water filtration system .
It's after reports of sickness and diarrhoea that are believed to be associated with the leisure centres.
Health experts from Public Health England (PHE) and the council's environmental health department are investigating.
It's thought they could be closed for several days.
Dr Gayle Dolan, consultant in health protection at PHE’s North East Centre said:
Lindsey Murray, Service Director for Culture, Communities, Leisure and Volunteering:
Gateshead Council's Leisure Centres are not suspected to be the origin of the illness, instead it's believed to have been introduced to the pools by an infected user.