Heavy Metals in the Body: Sources, Effects of Exposure and Precautions

Heavy metals such as arsenic, mercury, lead and cadmium occur in the environment, and high or long-term exposure has been linked to health problems. This article covers sources, reported symptoms, the fact that diagnosis is made by a doctor with a blood test, and general precautions to reduce exposure. If you are concerned, see a doctor for diagnosis and treatment.

What Is Heavy Metal Poisoning?

Heavy metal poisoning is the result of excessive accumulation of heavy metal particles in the body. Toxic metals like arsenic, mercury, lead, and cadmium can invade the cells, binding to receptors for essential metals like iron, copper, calcium, or zinc that actually play a helpful role in cellular functioning. Heavy metals are not easily metabolized or excreted from the body, making it difficult to prevent accumulation from acute exposure.

A comprehensive 2024 review published in the Archives of Toxicology describes how heavy metals can disrupt biological functioning, in part by interfering with the body's antioxidant defense mechanisms. Losing resistance to oxidative stress and inflammation inhibits cellular growth, metabolism, reproduction, and detoxification, accelerating cell dysfunction and death. If toxic heavy metals continue to accumulate, acute toxicity can make it impossible for the organs to continue functioning efficiently, putting you at risk for a wide array of severe medical conditions.

Research has linked lead, arsenic, mercury, or cadmium poisoning to.

• Cardiovascular disease
• Gastrointestinal disorders
• Neurodegenerative disorders (like Alzheimer's and Parkinson's)
• Learning impairments (common in children suffering from lead toxicity)
• Cancer (specifically bladder, liver, kidney, skin, and lung cancer)
• Kidney disease
• Liver failure
• High blood pressure
• Rheumatoid arthritis
• Reproductive disorders
• Respiratory problems

Studies have also connected heavy metal toxicity with several rare disorders, including renal tubular dysfunction and skin cancer, particularly after high or long-term exposure. Children, pregnant women, and the elderly are particularly vulnerable to heavy metal exposure, with smaller quantities of toxic metals causing acute poisoning symptoms.

Diagnosing and Treating Heavy Metal Poisoning

Long-term exposure to heavy metals can lead to a variety of adverse symptoms. Some of the distinctive symptoms of heavy metal poisoning include:

• Abdominal pain
• Nausea and vomiting
• Diarrhea
• Chills
• Feeling dehydrated all the time
• Skin lesions
• Numbness or prickling sensations in the hands or feet
• Chronic feelings of weakness

As more time passes, you may experience a noticeable decline in lung function, develop an irregular heartbeat, show signs of anemia, or suffer kidney damage or liver damage.

Regardless of your symptoms, your doctor will need to perform a heavy metal blood test to conclusively diagnose a case of lead, arsenic, cadmium, or mercury poisoning.

The currently accepted heavy metal toxicity test is known as a heavy metals panel, and it will detect excessive concentrations of these toxic substances in your body. As part of your workup, your doctor may choose to perform additional tests, such as a complete blood count (CBC) to measure your levels of white and red blood cells, and targeted blood tests to detect early signs of liver or kidney failure.

If heavy metal poisoning is diagnosed, a doctor decides on treatment, which can include chelation therapy. This form of treatment relies on drugs known as chelating agents, which hunt down and bind with metal molecules before flushing them out of the body in urine.

Chelating agents are usually administered by intravenous (IV) injection, although oral supplements are sometimes provided. It’s essential to note that these drugs are powerful and should only be used under the direct supervision of a medical professional.

The Harmful Effects of Heavy Metals on the Brain

High exposure to toxic heavy metals has been associated with effects on the nervous system; if you are concerned about exposure, speak to a doctor.

Reported symptoms of heavy metal exposure affecting the nervous system include:

• Brain fog, or an inability to think quickly and clearly
• Memory loss
• Headaches
• Mood swings (anxiety, irritability, depression)
• Chronic fatigue

Reducing exposure to heavy metals is important for general health.

Reducing Exposure to Heavy Metals

To protect yourself and your loved ones from chronic exposure to heavy metals, you can take the following steps:

• Wash fruits and vegetables thoroughly before consuming.
• Only drink filtered water.
• Avoid eating a lot of fish that might be contaminated with organic mercury compounds (like mackerel, shark, swordfish, and Albacore tuna).
• Remove lead-based paint and lead pipes from any indoor spaces you regularly occupy, as lead exposure can be dangerous at even low levels.
• Quit smoking and/or avoid exposure to secondhand smoke (to prevent arsenic and cadmium poisoning).
• Only use tested and certified cosmetics, supplements, and personal care products.
• Clean out any liquids, solids, or construction materials in your home that might contain heavy metals.
• Avoid living or working in locations where air pollution is significant or environmental toxins are known to contaminate the soil or water.
• If you have to handle toxic substances in your work, be sure to use proper protective equipment at all times.

Heavy metal poisoning can pose a serious threat to human health. If you believe your exposure to toxic metals is beyond safe limits, you should take action immediately to address the situation, before you suffer severe consequences.