Main Page Content

A-Z Health Topics lists public health information that's not found in other areas of our website. You'll find a wide variety of topics here, most of which include links to other websites where you can find even more information.

If you think we're missing a topic, you can email us to suggest one by going to our Contact Us page.

Health Topics

A (9) | B (4) | C (10) | D (1) | E (5) | F (2) | G (3) | H (15) | I (5) | L (6) | M (9) | N (1) | O (1) | P (5) | R (4) | S (7) | T (5) | U (1) | V (3) | W (2) | Y (2) | Z (1)
An alphabetical listing of Health Topics.
Titlesort descending
Handwashing Hand Hygiene is the single most important way to control the spread of infection. View the list of steps on how to properly wash and sanitize your hands.
Head Lice

If your child comes home with head lice, you may have a lot of questions.

Heat Illness

For most people, heat-related illnesses happen when temperatures are high for a number of days (particularly if the night time temperatures do not drop), or if the humidity is high. While the health risks related to heat are higher for certain groups (such as seniors, young children, people taking certain medications and people with chronic conditions), everyone is potentially at risk. Fortunately, most heat-related illnesses can be prevented or treated if you are aware of the risks, signs and symptoms.

Hépatite A

L’hépatite A est une infection du foie causée par un virus. La maladie est généralement mineure chez les enfants, mais peut être plus grave chez les adultes.

Hepatitis A

Hepatitis A (Hep A) is an infection of the liver, caused by the hepatitis A virus.

Hepatitis B

Hepatitis B is a virus that can permanently damage your liver and is a leading cause of liver cancer. There is no cure for hepatitis B, and it can sometimes lead to death.

Hepatitis B Immunization Program for Grade 7 Students

Anyone of any age can get the hepatitis B vaccine. People of certain high risk categories are able to receive the provincially funded vaccine through our Health Unit.

Hepatitis B Vaccine

Anyone of any age can get the hepatitis B vaccine. People of certain high risk categories are able to receive the provincially funded vaccine through our Health Unit.

Hepatitis C

Hepatitis C is a virus that you can get from contact with an infected person’s blood.

HIV (AIDS)

HIV (Human Immunodeficiency Virus) is the virus that causes Acquired Immune Deficiency Syndrome (AIDS).

Human Papillomavirus (HPV)

HPV is a very common virus that can cause many types of cancers.

Human Papillomavirus (HPV) Vaccine

Females aged 9 to 45 years old and males aged 9 to 26 years old should get the HPV vaccine. The provincial government is funding the voluntary HPV vaccination program for all grade 7 males and females in Ontario. This means that all males and females starting in grade 7 can get the vaccine free from the Health Unit.

Hydrogen Sulfide

Hydrogen sulfide (H 2S) is a flammable (only at very high concentrations), colorless gas that smells like rotten eggs.

Impetigo

Impetigo is a highly contagious skin infection caused by bacteria called group A streptococcal (strep) or Staphylococcus aureus (staph). The infection happens when the bacteria get into scrapes and insect bites.

Indoor Tanning

Tanning can cause cancer. Sun lamps or tanning beds, just like the sun, give off ultraviolet radiation (UVR), a cancer-causing substance that causes harm to the eyes, early aging of the skin, wrinkling, and skin cancer.

Influenza (Flu)

Influenza (the flu) is a respiratory infection caused by the influenza virus. The flu season (when most people get sick with the flu) often begins in late fall.

Invasive Meningococcal Disease

Invasive meningococcal disease (IMD) is a serious infection caused by the bacteria, Neisseria meningitidis.  Up to 10% of the population carry the bacteria at the back of their throat or nose without ever getting sick.

Invasive Pneumococcal Disease

Invasive pneumococcal disease is a sudden and serious illness caused by a bacteria called streptococcus pneumonia.

La salmonellose

Qu'est-ce que la salmonellose? La salmonellose est une taxi-infection alimentaire causée par la germe Salmonella.

Lead in Drinking Water

Lead is a toxic metal that is found naturally in the air, soil, and water. It is also used in mining, manufacturing, and burning of fossil fuels. The amount of lead Canadians are exposed to has decreased since the 1970s, mainly due to the removal of lead in gasoline, paint, and solder in food cans (Government of Canada, 2013).

Lead in Schools, Private Schools and Child Care Centres

Ministry of Environment and Climate Change (MOECC) under the Ontario Regulation 243/07 requires all schools, private schools and child care centres to sample and test drinking water to measure the concentration of lead against the provincial drinking water guidelines for lead.

Legionella

Legionella are bacteria that live in water that can cause two types of illness in humans: Legionnaires’ disease and Pontiac fever.

Listeriosis

Listeria is a bacteria that can cause a rare but serious illness called listeriosis. Those who are pregnant, the elderly, and those with a weakened immune system have a higher risk of becoming seriously ill.

L’amibiase

L’amibiase est une infection intestinale causée par un parasite qui vit dans les matières fécales des personnes infectées.

Maladie méningococcique

Garder la vaccination de votre enfant à jour permet de le protéger contre bien des types de la maladie méningococcique.

Mandatory Blood Testing Act

The Mandatory Blood Testing Act reduces the time it takes to get results of certain blood tests.

Measles

Measles is a virus that’s very contagious. Most people recover from infection, but measles can have serious complications and lead to long-term health problems.

Meningitis

Meningitis is a disease caused by the inflammation of the protective membranes covering the brain and spinal cord known as the meninges. Meningitis may develop in response to a number of causes, usually bacteria or viruses, but can also be caused by physical injury, cancer, or certain drugs.

Meningitis (MenACYW) vaccine

People between 2 and 55 years old can have the meningitis vaccine.

Methicillin-Resistant Staphylococcus aureus (MRSA)

Methicillin-Resistant Staphylococcus aureus (MRSA), is a type of bacterium that's resistant to several antibiotics. In the community MRSA can cause skin and other infections. In a healthcare setting, such as a hospital or nursing home, MRSA can cause severe bloodstream and surgical site infections.

Mosquitoes

Mosquitoes are small insects belonging to the fly family. Mosquitoes usually lay 100-400 eggs at a time in still water. The female mosquito is the one that bites, as she needs blood to make her eggs. A mosquito bite usually results in a reaction including swelling, redness, and itchiness, and can vary from mild to severe.

Mould

There are many factors that can determine whether mould affects your health, such as the type of mould, how sensitive you are, and how healthy you are.

Mumps

Mumps is a viral illness that can spread from one person to another. Most people recover from the infection, but mumps can have serious complications and lead to long-term health problems. Since the widespread use of the mumps vaccine, mumps infection is rare.

Norovirus (Norwalk-like virus)

Norovirus is a very contagious virus that causes inflammation of the stomach and intestines (gastroenteritis). It is an illness that usually includes diarrhea and vomiting. You may have a norovirus sickness many times in your life because there are different types of noroviruses. Norovirus can spread quickly in a facility like a nursing home, retirement homes, daycares schools and cruise ships.

Opioids

Opioids are a family of drugs that are used to relieve pain. Opioids can also produce a sense of euphoria (a high), which may lead people to use them improperly. There are prescriptions opioids like codeine, fentanyl, morphine, and methadone and illegally produced opioids like “bootleg” fentanyl.

Pertussis Whooping Cough

Whooping cough is also known as pertussis.