Upadhyay submitted the resignation to Governor K N Tripathi at the Raj Bhavan.
The West Bengal State Election Commission on Sunday postponed counting of votes in the election to Bidhannagar and Asansol municipal corporations following allegations of large-scale violence, even as opposition parties demanded fresh elections.
Polling for the 144-seat Kolkata Municipal Corporation is underway amid tight security arrangements.
According to the Federation of Resident Doctors Association, during the indefinite strike, all outpatient departments, operation theatres, and ward duties will be shut, but emergency services will continue to operate as usual, ensuring that urgent patient care remains unaffected.