NEW YORK (AP) — Thousands of New York City nurses returned to the picket lines Tuesday as their strike targeting some of the city’s leading hospital systems entered its second day.

Union officials say roughly 15,000 nurses walked off the job Monday morning at multiple campuses of three hospital systems: NewYork-Presbyterian/Columbia, Montefiore Medical Center, and Mount Sinai.

The affected hospitals have hired droves of temporary nurses to try to fill the labor gap.

Thousands of New York City nurses returned to the picket lines Tuesday as their strike targeting some of the city’s leading hospital systems entered its second day. Victor M Matos/TheNEWS2 via ZUMA / SplashNews.com

Picketers hold signs outside the entrance to Mount Sinai Hospital on Monday, January 12, 2026, in New York City. IPA / SplashNews.com

Both nurses and hospital administrators have urged patients not to avoid getting care during the strike.

The labor action comes three years after a similar strike forced medical facilities to transfer some patients and divert ambulances.

As with the 2023 labor action, nurses have pointed to staffing issues as a major flashpoint, accusing the big-budget medical centers of refusing to commit to provisions for safe, manageable workloads.

Union officials say roughly 15,000 nurses walked off the job Monday morning at multiple campuses of three hospital systems: NewYork-Presbyterian/Columbia, Montefiore Medical Center, and Mount Sinai. IPA / SplashNews.com

The affected hospitals have hired droves of temporary nurses to try to fill the labor gap. Edna Leshowitz/ZUMA / SplashNews.com

A protester holds a sign featuring Mount Sinai CEOs with their faces on baked potatoes and their salaries listed, during the 2026 New York City Nurses Strike. Victor M Matos/TheNEWS2 via ZUMA / SplashNews.com

The private, nonprofit hospitals involved in the current negotiations say they’ve made strides in staffing in recent years and have cast the union’s demands as prohibitively expensive.

On Monday, the city’s new mayor, Zohran Mamdani, stood beside nurses on a picket line outside NewYork-Presbyterian, praising the union’s members for seeking “dignity, respect, and the fair pay and treatment that they deserve.”