What is Mercury?
Mercury is a metal that occurs naturally. It comes in several forms, including a shiny, silver-white liquid and a tin-white solid. If it is heated, it becomes a colorless gas. It is emitted from burning coal and waste, and from volcanoes.
Methylmercury is the most common mercury compound. It forms in water and soil and builds up in the tissues of fish.
Where is Mercury found?
- Consumer products - thermometers, barometers, vapor and fluorescent lamps, fluorescent bulbs, mirror coatings, dental fillings, batteries, cosmetics, and herbal remedies and pharmaceuticals
- Food – fish and shellfish
- Air – emissions from mercury spills, incinerators, coal-burning power plants, and some industries
How can I be exposed to Mercury?
Mercury commonly enter(s) the body through:
- Eating fish or shellfish contaminated with methylmercury, swallowing releases of mercury from some dental fillings, or drinking contaminated water
- Breathing mercury vapors from spills, incinerators, coal-fired power plants, and industry emissions
- Touching liquid mercury or products made with mercury
What happens when I am exposed to Mercury?
Exposure to high levels of mercury can cause mercury poisoning.
Short-term exposure to high levels of mercury can cause:
- Lung irritation and damage
- Nausea and vomiting
- Increased blood pressure
- Loss of coordination
- Skin rashes
- Eye irritation
Long-term exposure to high levels of mercury can cause:
- Brain and kidney damage
- Damage to a developing fetus
- Tremors and numbness
- Changes in vision or hearing
- Memory problems
- Muscle weakness
- In children exposed to mercury during pregnancy, motor and cognitive difficulties, and sensory problems
Chronic poisoning by methylmercury can lead to death.
Who is at risk for exposure to Mercury?
- Some consumer products and foods contain mercury.
- Pregnant and nursing women
- Exposure can damage a developing fetus and pass into breast milk.
- Subsistence fishers and their families
- People who rely on subsistence fishing may eat more contaminated fish.
Reduce your risk
If you think your health has been affected by exposure to mercury, contact your health care professional.
Always wash your hands thoroughly after handling chemicals. For poisoning emergencies or questions about possible poisons, please contact your local poison control center at 1-800-222-1222.
- Does your thermometer contain mercury?
- Do you use fluorescent lamps or light bulbs?
- Do you use medicines that contain mercury?
- Do you eat a lot of fish that may contain mercury?
- Carefully handle and dispose of products that contain mercury, such as thermometers or fluorescent light bulbs.
- Do not touch or vacuum spilled mercury.
- If a large amount of mercury has been spilled, contact your health department immediately.
- Properly dispose of older medicines that contain mercury.
- Learn about wildlife and fish advisories in your area from your public health or natural resources department.
- Eat low-methylmercury fish such as shrimp, canned light tuna, salmon, pollock, and catfish.
- Avoid or limit eating fish that contain high levels of methylmercury, such as shark, swordfish, king mackerel, and tilefish.
- Teach children not to play with shiny, silver liquids.
- Keep children away from all mercury-containing medicines and products.
- Pregnant women and children should avoid rooms where liquid mercury has been used.
- Young children, women who are pregnant or who may become pregnant, and nursing mothers should avoid eating fish that contain high levels of methylmercury.
National Library of Medicine Resources and Databases
Science Classroom (Grades 6-8)
Enhance your education on toxic chemicals in our environment using lesson plans, games and activities, videos, informational websites, and more.
National Library of Medicine
An animation about mercury, where it is found, how it is used, and the effects on human health.
Environmental Protection Agency
Activities for middle school students about mercury in the environment, in schools, and at home.