Around 300 people have attended a rally in Llandudno in support of their local hospital.
Protesters marched through Llandudno before a rally was held
Campaigners want to see all services maintained at the hospital, but health chiefs have proposed moving some to other areas of north Wales.
Assembly election candidates from the main parties outlined their plans if they are elected on 3 May.
The local health board said it was working to make the best use of the hospital in the future.
In September, campaigners won a fight to keep a cancer unit at Llandudno, but other services, including the coronary care unit, remain under threat.
Linda Groom, from the hospital action group, said: "We want to highlight the situation at Llandudno Hospital.
"We have also thrown down the gauntlet to the political parties to tell us what they will do - and tell the public what they will do to the hospital - if they are elected."
She said the action group wanted to see the hospital upgraded not downgraded, and that it would not be "viable" for many people in the town to travel to other hospitals in the area for treatment.
The protesters include campaigners from Blaenau Ffestiniog, who are concerned about their hospital.
All the Aberconwy election candidates were given the opportunity to speak at the demonstration.
Campaigners are worried coronary services nay move from Llandudno
Labour has already announced what it describes as a "guarantee" for the hospital to have a strong future, although this does not include keeping all current services at the hospital.
The Conservatives have urged opposition to any downgrading, saying that the removal of key services "would signal the end of any meaningful local care services" in the area.
Plaid Cymru has called the plans "disgraceful" and said they should be withdrawn, and for the proposals to go "back to the drawing board."
The Welsh Liberal Democrats said they were supporting campaigners and that the plans had "attempted to railroad local people with limited consultation, and a solution imposed from above".