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Mercury Poisoning: What You Should Know | by heidi


Mercury is a heavy metal found in nature and exists in small doses in many household products.1 Mercury poisoning can occur when someone comes in contact with or ingests too much mercury.

In minimal doses, mercury is generally considered safe. However, mercury is a known neurotoxin that can cause many adverse health effects in higher amounts. The most common form of mercury poisoning occurs from consuming fish and seafood containing high levels of mercury.

This article provides an overview of mercury poisoning, symptoms, complications, diagnosis, and treatment.

Woman lying on couch sick

Causes and Symptoms

Mercury is a neurotoxin that can damage nerve tissue in the body and negatively affect nervous system function. There are different types of mercury poisoning with different symptoms.


One of the most common types of mercury poisoning comes from exposure to methylmercury. This most commonly occurs when people eat fish or shellfish containing high amounts of methylmercury.2

Symptoms of methylmercury poisoning may include:2

Muscle weakness

Loss of coordination

Loss of peripheral vision (side vision)

Prickling sensation in the hands, feet, or around the mouth

Impairment of speech or hearing

Difficulty walking

Metallic Mercury

Another type of mercury poisoning can occur from exposure to vapor from metallic mercury.

This type can occur when metallic mercury breaks or spills and the vapors become exposed to air. Metallic mercury can be found in dental fillings, thermostats, jewelry, and school laboratories.

Breathing in this type of mercury vapor can cause:2


Emotional changes

Sleeping difficulties

Weakness, muscle twitching, or atrophy (loss of muscle tissue)


Changes in nerve responses

Poor thinking ability

Impaired kidney function, respiratory issues, or even death (when at high levels)

Other Types of Mercury

Inorganic mercury can sometimes be found in everyday household products such as fungicides, preservatives, antiseptics, skin-lightening products, and anti-aging products.2

This type of mercury exposure occurs by being absorbed through the gastrointestinal tract and kidneys and may cause:2

Skin rashes

Muscle weakness

Mood swings

Memory loss

Mental disturbances

Effects on Infants and Children

Methylmercury exposure can harm infants in the womb when their mothers consume fish or seafood with high mercury levels. This exposure can negatively affect brain and nervous system development.

Children who have been exposed to methylmercury before birth have been known to have difficulties with:2

Cognitive thinking



Fine motor skills

Visual-spatial skills

High levels of prenatal mercury poisoning can also cause a form of cerebral palsy, a group of disorders affecting movement, posture, and muscle tone.1 Lower doses during pregnancy are more likely to cause neurodevelopmental or cognitive delays.1

Mercury poisoning symptoms occurring in children after birth may include:1

A pins-and-needles sensation (paresthesias)

Loss of coordination (ataxia)

Visual and auditory issues



Mercury poisoning can be diagnosed with a blood test, urine test, or hair test (for long-term mercury exposure). You will need to see your healthcare provider, who will likely perform a physical exam, ask about your symptoms, and gather information about your past medical history.

Methylmercury positioning—from eating fish and seafood high in mercery—requires a blood test for diagnosis. Urine mercury levels do not help determine this type of mercury poisoning.3


The first step for treatment requires identifying the source of mercury exposure and removing it.

People with high levels of mercury poisoning in the blood may also be prescribed chelation therapy. Chelation therapy is a medical procedure that involves using chemicals or medications to remove heavy metals and other substances from the body.

A chelating agent can be injected directly into the bloodstream through an IV (intravenous drip) or given as a pill by mouth. The chelating agent binds to mercury and other toxins and exits the body through urination.


Mercury is a neurotoxin that can cause many adverse health effects at high levels. The most common form of mercury poisoning occurs from consuming high-mercury fish and seafood.

Mercury can damage the nervous system and cause symptoms such as muscle weakness, loss of coordination and peripheral vision, prickling sensations, and more. Methylmercury exposure can negatively affect infants in the womb and adversely affect their brain and nervous system development.