Our UHN programs and services are among the most advanced in the world. We have grouped our physicians, staff, services and resources into 10 medical programs to meet the needs of our patients and help us make the most of our resources.
University Health Network is a health care and medical research organization in Toronto, Ontario, Canada. The scope of research and complexity of cases at UHN has made us a national and international source for discovery, education and patient care.
Our 10 medical programs are spread across eight hospital sites – Princess Margaret, Toronto General, Toronto Rehab’s five sites, Toronto Western – as well as our education programs through the Michener Institute of Education at UHN. Learn more about the services, programs and amenities offered at each location.
Maps & Directions
Find out how to get to and around our nine locations — floor plans, parking, public transit, accessibility services, and shuttle information.
Ways You Can Help
Being touched by illness affects us in different ways. Many people want to give back to the community and help others. At UHN, we welcome your contribution and offer different ways you can help so you can find one that suits you.
The Newsroom is the source for media looking for information about UHN or trying to connect with one of our experts for an interview. It’s also the place to find UHN media policies and catch up on our news stories, videos, media releases, podcasts and more.
For many Canadians, warmer weather means more time outside.
But more time outside means more opportunities to be bitten by insects and other creepy crawlers, whether you're enjoying the sun in the city or at the cottage.
In this three-part series, Dr. Jay Keystone, a physician in the tropical disease unit at Toronto General Hospital, UHN, breaks down how to recognize different bites and what you can do to treat them.
Today, he discusses flies.
Where to find them: Black-flies, deer-flies, stable-flies and horse-flies are all commonly found in Ontario. Watch for flies at the cottage or other rural settings.
What are the symptoms: Dr. Keystone says fly bites are often bigger than mosquito bites, with a dark centre at the site of the bite.
“A black fly bite is usually bigger than a mosquito bite, and they can be quite uncomfortable,” says Dr. Keystone.
“Also black flies are not as bad as other flies, because they have a different biting mechanism, but they can be quite painful.”
There are various different flies that bite in Ontario, but Dr. Keystone says he likely wouldn’t be able to tell the bite of one fly from another.
What are the risks: There are virtually no risks associated with fly bites apart from the pain. According to Dr. Keystone, a significant allergic reaction to a fly bite would be very rare.
"These insects are mostly just nuisance," he says.
What you can do: For particularly swollen or painful bites, Dr. Keystone recommends icing the affected area. Wrap ice in a cloth to avoid direct contact with the skin, and hold over the affected area for 10-15 minutes once per hour until the pain subsides.
Dr. Keystone says it's safe to take non-prescription painkillers to reduce the symptoms of a bad bite.
Want to know more? "What's bugging you?" wraps up Thursday when Dr. Keystone discusses ticks.