"People unprepared for normal activities - people hiking and doing silly things, or who have taken too much alcohol and think they are superhuman and jump off things they normally wouldn't jump off, and people who don't wear lifejackets on the water."
Tauranga and Rotorua Hospitals also count New Year's Day among their busiest of the year and extra staff are rostered on during that time. Waikato Hospital is the main provider for people with more serious conditions such as heart attacks, drownings, burns or injuries from serious car accidents.
Dr Large said while GPs were often closed during the public holiday, there was always a doctor on call to help.
"The problem with people coming in for their prescriptions, is it takes away from patients having a heart attack, or who have crashed their car or have a dislocated shoulder."
Waikato Hospital emergency department clinical director Dr John Bonning said it was frustrating for staff when patients didn't plan ahead for their medical problems and he wanted to make sure they knew they had other options before they visited the emergency department.
"The emergency department can be unbelievably busy and there's not as much infrastructure available to us around the hospital."