Sefton surgeon Dr Gareth Harrison said he has written a letter to people in the borough because he is concerned about the future of the NHS in the hands of the Conservatives.
Dr Harrison, 35, who is a registrar at a local hospital, is urging people in Sefton to vote Labour on May 3 to send a message to the government about the NHS.
He said he wrote the letter to raise his concerns about the Tory-Lib Dem government's health and social care bill which he says will result in "NHS care being delayed with a reduction of quality and choice".
Dr Harrison said: "I wrote the letter to the voters of Sefton because I have some real concerns about this Tory-Lib Dem government's plans for our NHS.
"As a local registrar, I see the work of the NHS every single day and I can see damage starting to occur due to the Tories' and Lib Dems' Health Bill and further damage to the service will happen in the future.
"This bill will see GPs spending more time on commissioning services instead of treating patients, which means that people may not be able to see their own GP but instead a locum doctor who doesn't know their medical history.
"While the government is insisting that the NHS needs to make savings of £20billion, the new bill introduces extra bureaucracy with extra costs and NHS managers concentrating on saving their job instead of making efficiency savings.
"Private patients will receive preferential treatment in existing NHS hospitals which will further reduce bed capacity and make already growing waiting lists even longer.
"And this bill opens the door to the NHS being exploited by foreign health care providers.
"These are the fears which I and many of my colleagues in the NHS have and why I have written my letter to the people of Sefton."
Dr Harrison is urging people in Sefton to vote Labour to send a message back to the Tory-Lib Dem government.
Dr Harrison added: "My views obviously are not the views of the hospital trust, who must remain non-political, but they are shared by many NHS colleagues and patients who are concerned about the Tories' and Lib Dems' plans.
"I am urging people in Sefton to vote Labour on May 3 because the Labour Party is the only party who I believe will safeguard the future of the NHS.
"I would have written to the people of Sefton on this issue anyway, but as we are now in the election period, I am obliged by election law to include the small imprint on the bottom of my letter associating my comments to the Labour Party.
"This is one of the most important local elections of recent times. We need to send a message to this Tory-Lib Dem government. The only way to do that is to vote Labour."