Health campaigner Guy Grainger says spending cuts by United Lincolnshire Hospitals Trust will hit patients in the Rasen area.
“Most people in Market Rasen go to Lincoln, but any cuts in services will make the situation worse by squeezing more people in,” he said.
His comments follow the trust revealing it must make massive cuts to prevent it heading for a budget deficit of £365m a year.
It is understood the future of the A&E departments and maternity services at Boston Pilgrim Hospital will form a key part of a widespread money saving review.
Existing facilities at other hospitals - including Skegness and Louth - will also be on the agenda.
A&E departments could effectively be ‘downgraded’ with urgent cases transferred to Lincoln General Hospital which would be a ‘major’ emergency centre.
A United Lincolnshire Hospitals Trust (ULHT) spokesman – which runs the Pilgrim - said: “No decisions have been made on the future of our A&E and maternity services.
“United Lincolnshire Hospitals Trust is committed to delivering safe, high quality affordable services. As part of a national review into urgent and emergency services, led by Sir Bruce Keogh, it is being proposed that hospital A&Es will be re-classified in the future. In five years, health and care organisations in Lincolnshire will have a combined budget deficit of over £365m per year if we do nothing.”