Mercury and Arsenic Exposure in India: Sources, Symptoms, Testing and When Chelation Is Needed

A thermometer slips from your hand and silver beads scatter across the bedroom floor. Or a relative who grew up in a village in Bihar or West Bengal mentions that the old family hand pump was marked unsafe years ago, and now you wonder about the dark spots on their palms. Or a friend has been using a “fairness” cream bought loose from a market stall and has developed swollen feet. Each of these situations raises the same quiet question: could mercury or arsenic be affecting our health?

The honest answer for most people is that everyday exposure is low and manageable, and serious poisoning is uncommon. But there are real sources in India worth knowing about. In this guide, our doctors explain where mercury and arsenic come from, the symptoms that deserve attention, who is most at risk, which tests are reliable (and which are not), when chelation therapy is truly appropriate, and simple steps to protect your family.

Why mercury and arsenic deserve a closer look

Mercury and arsenic are naturally present in the earth’s crust, so tiny amounts are everywhere. The body can handle very small, occasional amounts. Problems arise with higher doses, or with steady exposure over months and years, when these metals interfere with nerves, kidneys, skin, blood vessels and other organs.

Our earlier guide to lead poisoning and its hidden sources in India covered the most common household metal problem. This article focuses on the two others that patients most often ask us about. For a broader look at the treatment itself, read chelation therapy: who really needs it and how heavy metal poisoning is tested.

Where does arsenic exposure come from in India?

Groundwater in certain regions

The most important source is naturally occurring arsenic in groundwater. It has been well documented in parts of the Ganga and Brahmaputra plains, including areas of West Bengal, Bihar, Uttar Pradesh, Assam and Jharkhand, and smaller pockets have been reported in other states. Arsenic in water has no colour, smell or taste, so a well or bore water source can look perfectly clean and still contain it. Only a water test can tell.

Most homes in Bengaluru using municipal supply are not in a known high-arsenic belt, but families who have moved from affected regions, or who still spend long periods at a native place drinking untested well water, may have had years of exposure.

Food grown or cooked with contaminated water

Rice takes up arsenic from soil and water more readily than many other crops, and cooking rice in contaminated water adds more. In affected areas this can be a meaningful source even after drinking water has been made safe. Cooking rice in plenty of clean water and draining the excess, as many Indian households already do, reduces the amount.

Other sources

Some unregulated traditional or herbal preparations have been found to contain arsenic, as have certain older pesticides and wood preservatives. Some industries, such as smelting and certain chemical work, also carry occupational risk.

Where does mercury exposure come from?

Mercury comes in three main forms, and each behaves differently in the body. This is why the source matters so much when a doctor decides which test to order.

• Broken thermometers, old BP machines and fluorescent lamps (elemental mercury). The liquid metal gives off vapour at room temperature, and breathing that vapour is the main risk. Swallowing a small amount of liquid mercury from a thermometer is usually far less dangerous than people fear, because very little is absorbed from the gut. Heating mercury, or vacuuming it up, is what turns a small spill into a real hazard.
• Some fish (methylmercury). Mercury builds up along the food chain, so large, long-lived predatory sea fish tend to carry more than small fish. For most adults, fish remains a healthy food. The main concern is for pregnant women, breastfeeding mothers and young children, whose developing nervous systems are more sensitive.
• Some skin-lightening creams (inorganic mercury). Mercury salts have been found in some unregistered or imported “fairness” and spot-removal creams. Used daily for months, these can harm the kidneys and nerves. Such creams sometimes also contain strong steroids, which bring their own problems, explained in our article on steroid side effects.
• Some unregulated remedies. A few traditional preparations deliberately include processed mercury compounds, and others are contaminated during manufacture. This does not mean all traditional medicines are unsafe. It does mean that products without proper labelling or licensing, bought online or from unknown sellers, carry an unknown risk.
• Certain jobs. Gold and jewellery processing using mercury, some lamp and instrument manufacture, and some chemical industries.

What about dental fillings? Silver amalgam fillings contain mercury and release very small amounts. Major health bodies do not advise removing healthy fillings, since drilling them out can itself release more vapour.

What are the symptoms of mercury and arsenic exposure?

Symptoms depend on the metal, its form, the dose and how long the exposure lasted. Many of them are vague and shared with far more common conditions, which is why a careful history matters more than any single symptom.

Tingling and burning feet deserve a special mention. Arsenic and mercury can both cause nerve damage, but in Bengaluru far more people have nerve symptoms from diabetes or low vitamins. Our guide to diabetic neuropathy or sciatica and our article on vitamin D and B12 deficiency explain these more common causes. Similarly, tiredness, aches and poor concentration are far more often due to an underactive thyroid, poor sleep or stress and low mood than to metal poisoning. A good doctor checks all of these rather than jumping to one explanation.

Who is most at risk?

• Families who drank untested well or hand pump water for years in known arsenic-affected areas.
• Pregnant women and young children, because a developing brain and nervous system is more sensitive to mercury and arsenic.
• People using unlabelled skin-lightening creams or unregulated remedies for long periods.
• Workers in jewellery and gold processing, smelting, lamp or instrument manufacture, e-waste recycling and some chemical industries.
• People with kidney disease, as the kidneys clear both metals and are also harmed by them.

How are mercury and arsenic tested properly?

Testing should start with a doctor’s consultation, not with a package bought online. The doctor asks about water sources, diet, creams, remedies, work and hobbies, then chooses the test that fits the suspected metal and form. Results are read alongside a kidney function test, urine protein, blood sugar and other routine checks.

Urine tests

Urine is the main test for arsenic and for exposure to mercury vapour or mercury creams. A 24-hour collection is often preferred, though spot samples corrected for urine concentration are also used. One important detail: seafood contains a harmless organic form of arsenic that can make a total urine arsenic result look high. Labs can separate the forms (speciation), and you may be asked to avoid fish and seafood for a few days before the test.

Blood tests

Blood mercury reflects recent exposure and is the better test for methylmercury from fish. Blood arsenic clears quickly, so it is mainly useful within days of a sudden, large exposure, not for long-term well water use.

The limits of hair and nail testing

Hair and nails can store arsenic and methylmercury, and researchers use them in population studies. For an individual patient, though, they are easily affected by dyes, oils, shampoos, dust and water, and lab methods vary. A “high” hair result on its own should not lead to treatment. Be equally cautious about “provoked” or “challenge” urine tests, where a chelating drug is given first and the urine is then tested. There are no valid normal ranges for this, so almost everyone appears to have a high reading.

When is chelation therapy appropriate?

Chelating medicines bind to certain metals in the body so they can be passed out in the urine. For mercury and arsenic, doctors may use oral or injected agents depending on the metal, its form and how unwell the person is. Chelation is appropriate when:

1. Poisoning is confirmed by reliable blood or urine tests, not by hair analysis or provoked urine tests.
2. Levels are significantly raised and usually accompanied by symptoms or organ effects such as kidney or nerve involvement.
3. A specialist is in charge, typically a physician experienced in toxicology, with kidney function, minerals and blood counts monitored throughout.
4. The source has been removed. Chelating someone who still drinks contaminated water or still uses the same cream achieves little.

For long-term arsenic exposure from water, the evidence that chelation reverses established skin or nerve changes is limited. Switching to safe water, good nutrition and regular follow-up remain the mainstay. Chelation also has real risks, including strain on the kidneys, loss of useful minerals such as zinc and copper, allergic reactions and, with the wrong drug or dose, dangerous drops in blood calcium. It should never be taken as a general “cleanse”. Our article on whether you really need a detox explains how the liver and kidneys already do this work, and our guide to IV drips and rejuvenation injections covers why a drip is not a shortcut either.

How Dr Heal can help

Concerns about metal exposure often arrive together with aches, tingling or tiredness. Our role is to look at the whole picture calmly:

1. A careful history and examination. Our doctors ask about water, food, creams, remedies and work, and examine the skin, nerves and joints, so exposure is neither ignored nor exaggerated.
2. Sensible tests under one roof. Our in-house laboratory and radiology at our facilities handle routine blood, urine, kidney and sugar tests, and we arrange the right metal-specific tests with accredited labs when they are needed.
3. Looking for other causes too. Through functional medicine and clinical nutrition we check thyroid, vitamins, blood sugar, sleep and diet, which explain many of the same symptoms.
4. Care for related pain. If nerve or joint pain is part of the picture, our pain specialists offer steroid-free care, including a regenerative preparation made through Dr Heal Pharma when an injection is truly needed, plus guided rehabilitation. See our joint pain treatment and regenerative medicine pages.
5. Referral and coordination. If poisoning is confirmed, we coordinate with a physician experienced in toxicology, a nephrologist or a dermatologist, so chelation, if needed, happens in the right setting with proper monitoring.

How to lower mercury and arsenic exposure at home

• Test well and bore water if you live in, or regularly stay in, a known arsenic-affected area. Use a safe, tested source for drinking and cooking. Boiling does not remove arsenic.
• Cook rice in plenty of clean water and drain the excess, and vary your grains with millets such as ragi and jowar. Our guide to diet and arthritis pain has more ideas for a balanced plate.
• Switch to digital thermometers and BP machines, and store old mercury devices safely until you can hand them in.
• Clean a small spill carefully. Open windows, keep children and pets away, wear gloves, gather beads with stiff card and sticky tape, and seal them in a jar. Never use a vacuum cleaner or broom, never pour mercury down the drain and never heat it. Ask your local municipal office about hazardous waste disposal. The same steps apply to a broken fluorescent tube or CFL lamp.
• Choose fish wisely, especially in pregnancy and for young children: favour smaller fish and limit large predatory sea fish.
• Avoid unlabelled creams and remedies. Use only licensed products with clear ingredient lists, and tell your doctor about everything you take. Never stop medicines prescribed by your doctor without discussing it first.
• Protect yourself at work with ventilation, gloves, masks and changing clothes before coming home, so dust is not carried to children.

Frequently asked questions

I broke a mercury thermometer. Should I get tested?

Usually not. The mercury in one thermometer is a small amount, and if the spill was cleaned up safely in a ventilated room, the risk is low. Testing is worth discussing if the mercury was heated, vacuumed, left in a closed room for a long time, or if someone develops symptoms.

Can arsenic in water cause tingling and burning feet?

Yes, long-term arsenic exposure can damage nerves, usually along with skin changes on the palms and soles. However, diabetes, low B12 and thyroid problems are far more common causes, so these should be checked too. Our article on prediabetes and HbA1c explains the sugar tests.

Is it safe to eat fish if I am worried about mercury?

For most people, yes. Fish is a good source of protein and healthy fats. Choose smaller fish more often and limit large predatory sea fish, particularly during pregnancy, while breastfeeding and for young children.

Is a hair test enough to diagnose heavy metal poisoning?

No. Hair results are easily affected by external contamination and lab methods vary. Diagnosis rests on symptoms, exposure history and properly chosen blood or urine tests read by a doctor.

Should I take chelation as a precaution?

No. Chelation is a medical treatment with real side effects, meant for confirmed, significant poisoning under specialist care. Removing the source, a balanced diet and normal kidney and liver function are what protect most people. If long-standing aches are your main concern, our guide to living with chronic pain may help.

Where can I get advice on mercury or arsenic exposure in Bengaluru?

Dr Heal Pain Cure Hospital offers consultations, routine blood and urine tests and coordination with specialists at its HSR Layout and Banashankari branches. Both are open 24 hours, and patients visit from all over Karnataka. You can also browse our treatments or read more on our health blog.

This article is for general information and is not a substitute for a medical consultation. Please see a doctor for advice about your own symptoms.