Heavy metals like lead, mercury, arsenic, and aluminum accumulate in tissue over years and can drive fatigue, brain fog, and nerve symptoms long after the exposure stops. Routine blood tests often read normal because they only capture recent exposure, not the stored burden. An environmental medicine evaluation looks at exposure history first, then targeted testing, before any treatment.
Heavy metal toxicity is one of the most overlooked drivers of chronic, unexplained symptoms we see at iHeal. Patients arrive after years of fatigue, cognitive changes, or nerve symptoms, often with a stack of normal lab reports. The problem is rarely that the testing was wrong. It is that the wrong question was asked.
Metals do not stay in the bloodstream. They move into bone, brain, kidney, and other tissue, where they can sit for years. A standard blood lead or mercury level mostly reflects what you were exposed to in the last few weeks. For a slow accumulation that built up over a decade, that snapshot can look completely normal while the stored burden continues to affect how you feel.
01 What symptoms can heavy metals cause?
Because metals affect the nervous system, energy production, and detoxification pathways, the symptoms are broad and easy to attribute to something else. Many patients have been told their labs are fine and the problem is stress.
The patterns we see most often include persistent fatigue that rest does not fix, brain fog and word-finding trouble, numbness or tingling in the hands and feet, headaches, mood changes, and disrupted sleep. When several of these appear together and have no clear explanation, an exposure history is worth taking seriously. You can read more about how these show up on our pages for brain fog and chronic fatigue.
02 Where do heavy metals come from in Texas?
Exposure is local, and the Gulf Coast has its own profile. Knowing the likely sources is what turns a vague suspicion into a targeted evaluation.
The four metals we investigate most often in Texas patients: lead, mercury, arsenic, and aluminum. Each has its own common local sources and its own pattern of symptoms.
Mercury
The two common sources are dental amalgam fillings and large predatory fish. The EPA and FDA specifically advise limiting tuna, swordfish, marlin, and king mackerel because they concentrate methylmercury up the food chain. Patients who eat sushi several times a week are worth a closer look.
Lead
Homes built before 1978 may still contain lead paint, and older plumbing can leach lead into water. The CDC and ATSDR are clear that there is no safe level of lead exposure, and that stored lead can be released back into circulation during times of bone turnover such as pregnancy or menopause.
Arsenic
Private well water along the Gulf Coast can carry arsenic, and conventional rice is a well-documented dietary source the FDA tracks. Patients on private wells who have never had the water tested are a recurring pattern in our practice.
Aluminum
Cookware, antiperspirants, and some over-the-counter and pharmaceutical preparations contribute to aluminum load. It is rarely the whole story on its own, but it often shows up alongside the others.
03 Why Houston's industrial footprint matters
There is one more piece that sets this region apart. Houston is one of the largest petrochemical and refining centers in the country. That industrial density, from the Houston Ship Channel to the refineries and chemical plants around it, means residents here can encounter a broader mix of environmental exposures than people in less industrial areas. The EPA's Toxics Release Inventory tracks the chemicals industrial facilities release each year, and the greater Houston area consistently reports significant volumes.
In practice, that changes how we think about a Houston patient. We do not look at metals in isolation. Heavy refinery and petrochemical activity is associated with a wider exposure picture that can include heavy metals alongside petroleum distillates, plastics-related compounds such as endocrine-disrupting chemicals, and pesticides. A patient's environment here is rarely a single-exposure story, and we keep that fuller context in mind when we take the history.
04 Why do standard blood tests miss it?
This is the question patients ask most, and the answer is simple once you understand where metals live. A blood test measures what is circulating right now. If your exposure was years ago and the metal has since moved into tissue, the blood level can be normal while the tissue burden is not.
In environmental medicine, provoked urine testing is one approach used to estimate stored burden. A chelating agent is given to mobilize metals from tissue, and a timed urine collection measures what comes out. It is worth being candid here: this method is used widely in environmental and functional medicine, but it is not endorsed by all conventional toxicology bodies, and results have to be interpreted carefully by a physician who knows the limitations. We walk through exactly how we approach this on our how we evaluate page.
One more point on testing: we look at the full metal panel rather than a single element. That includes lead, mercury, arsenic, and aluminum, and for patients with a history of contrast-enhanced MRI scans, it also includes gadolinium, a metal retained from imaging contrast that conventional metal screens usually leave out.
05 How is heavy metal toxicity treated?
Treatment is not a product or a single protocol. The sequence matters more than any individual step, and rushing it tends to make people feel worse.
The first and most important move is removing the ongoing source. There is no point mobilizing stored mercury if you are still eating swordfish twice a week, or chelating lead while you live with the old plumbing that caused it. After the source is addressed, the focus shifts to supporting the body's own elimination pathways, the liver, kidneys, and gut, so that mobilized metals actually leave the body rather than redistributing. Only then, and only when clinically appropriate, does targeted binding or chelation come into the conversation, always under physician supervision.
This staged approach is part of the larger 5M Framework Dr. Everett uses to sort through which exposures and responses are driving a given patient's symptoms, since metals rarely act alone.
06 When should you see an environmental medicine doctor?
If you have chronic symptoms with no clear diagnosis, a plausible exposure history, and normal conventional labs that do not match how you feel, that mismatch is exactly what an environmental medicine evaluation is built to investigate. We see Houston and Katy patients in person and patients across Texas by telehealth, and every evaluation starts with the history before any testing is ordered.
Not sure what is driving your symptoms?
Our 10-minute symptom assessment maps your history to the most likely environmental drivers before your first visit.
Take the Symptom AssessmentFrequently Asked Questions
Yes. Metals such as lead, mercury, and arsenic affect the nervous system and cellular energy production, and fatigue and cognitive symptoms are among the most commonly reported effects. Because stored metals are not always visible on routine blood tests, these symptoms are frequently attributed to other causes first.
Blood tests mostly reflect recent exposure. Metals that accumulated over years move into bone and tissue, where a standard blood level may read normal even when the stored burden is significant. Estimating tissue burden requires a different testing approach, interpreted by a physician familiar with its limitations.
We commonly investigate mercury from dental amalgam and large predatory fish, lead from pre-1978 homes and old plumbing, and arsenic from private well water and conventional rice. The right evaluation depends on each patient's specific exposure history.
Heavy metal treatment should always be supervised by a physician. Done incorrectly, mobilizing stored metals without first removing the source and supporting elimination pathways can worsen symptoms. The order of treatment matters, which is why it is not something to attempt with over-the-counter detox products.
Yes. Most of the evaluation, including the detailed exposure history and review of results, can be done virtually for patients anywhere in Texas. Specialty testing is coordinated at a lab near you, and results are reviewed together by video.
Matthew Everett, MD
Board-certified physician specializing in environmental medicine. Dr. Everett developed the 5M Framework after years of treating patients whose complex symptoms were dismissed by conventional medicine.
Sources
- CDC / ATSDR: Lead toxicity
- EPA: Mercury in fish and shellfish
- FDA: Arsenic in rice and rice products
- EPA: Toxics Release Inventory (TRI)
This article is for general informational purposes and does not replace personalized medical advice. Consult a qualified physician about your specific situation.