The doctors are demanding a hike in payment of salary that was promised to them earlier.
"More than 500 junior doctors went on an indefinite strike late Monday night Nov 9, demanding payment of the increased stipend they were promised after a round of agitations this Aug 2009," official said.
"All the patients died during the first 24 hours of the ongoing strike," an official said
The strike has badly hit the emergency services and dozens of surgeries have been postponed.
"Junior doctors were forced to go on strike as the government was not sticking to its promise," Naqui Imam, a leader of the junior doctors' association was quoted by news agency saying.
"In August after an assurance from the Bihar government of a hike in stipend, we withdrew our five-day-long strike. But we were not paid," a doctor said.