The nurses have been demanding regularisation of their service.
While many nurses were protesting in front of the hospitals in the districts, their state-level body has been staging agitation in the state capital.
"The nature of our work is no less than the regular nurses. Most of us are specially trained to deal with Sick Newborn Care Units and Intensive Care Units (ICU). However, our serice is not a regular oner," said Kamalini Sahoo, a nurse who is part of the agitation.
Odisha Nursing Employees Association general secretary Pravat Mohanty said: "We will have a discussion with the health minister about our demands tomorrow. If the government doesn't agree with our demands, the rest of the regular nurses will also join the strike from Thursday."
Health and Family Welfare Minister Pratap Kumar Jena said the government will regularise their services. But it requires some time as the department need permission from general administration and finance department.