Does heavy metal exposure increase the risk of dying from a stroke?

What's actually in it

Lead, cadmium, and mercury enter your body through food, water, and the environment. Lead from old plumbing and paint, cadmium from food grown in contaminated soil, mercury from fish. These metals accumulate in tissue over decades.

They damage blood vessels, increase blood pressure, promote blood clotting, and trigger inflammation — all of which are direct risk factors for stroke.

What the research says

A 2026 cohort study in Environmental Health followed thousands of adults who had survived a stroke and measured their long-term mortality. People with higher blood and urine levels of lead, cadmium, and mercury had significantly higher rates of death in the years after their stroke compared to those with lower levels.

The association held even after accounting for age, smoking, diet, and other cardiovascular risk factors. The metals appear to worsen outcomes through several pathways: ongoing arterial damage, impaired recovery of blood vessel function, and direct toxicity to brain tissue that had already been injured by stroke.

The researchers noted that the levels associated with higher mortality were within the range of normal population exposure in the US, not extreme industrial exposures. Avoiding high-mercury fish, testing your home's water for lead, and reducing cadmium-heavy food intake can lower these background levels over time.