The 'Our Childrens Health' online petition has received over 25,000 signatures in less than one day.
The campaign was launched this afternoon in Dublin by nine-year-old Louise Shortall who was just recently granted a one year medical card, despite the fact that she was diagnosed with cancer two years ago.
A spokesperson for the campaign, which was initiated by little Louise's family, said this evening that the volume of support was so great that the site has temporarily crashed.
However, they are asking people to remain patient and supportive as they hope it will be repaired soon.
"There were over 25,000 during the day but as soon as the evening news bulletins carried the story of the campaign launch the site couldn't cope with the volume of traffic," Kevin Shortall said.
"We were taken by surprise by the huge numbers wanting to sign the petition, but we're working to fix the problem and design the site to be able to carry a much larger number of people at any time," he added.
The 'Our Children's Health' campaign is calling upon the government to amend the 1970 Health Act so that all children who are seriously ill or suffer from a congenital condition receive a medical card for the duration of their treatment.
Peter Fitzpatrick, cofounder of the campaign, said today that it has been received positively and that they will remain in action for as long as they need to.
He was inspired to start the campaign after he seen his family become embroiled in the medical card fiasco with the HSE, as his brave niece was consistently being issued with temporary medical cards, despite the fact that she is due to undergo treatment until next year.