Microplastics and nanoplastics, tiny fragments of plastic debris, have been found to accumulate in human arterial plaques, raising concerns about their impact on cardiovascular health1 . Recent studies reveal that people with microplastics in their artery plaques face a significantly higher risk of heart attack, stroke, or death within a few years2 . This emerging evidence suggests that these plastic particles may play a role in the development and progression of serious heart diseases3 .
Microplastics and Cardiovascular Health Link
“It's not just that diseased arteries have more plastics. But those with diseased arteries causing symptoms have far more plastics.”
— Dr. Ross Clark, University of New Mexico7
Microplastics (MPs) and nanoplastics (NPs) are increasingly detected in human tissues, including the fatty plaques that build up inside arteries, known as atheromas4 . These plaques contribute to carotid artery disease and coronary artery disease, which can lead to heart attacks and strokes1 . In a recent observational study involving patients undergoing carotid endarterectomy—a surgical procedure to remove plaque from neck arteries—microplastics were found in nearly 60% of plaque samples5 .
The presence of these plastic particles in plaques was associated with a 4.5-fold increase in the risk of major adverse cardiovascular events (MACEs), including myocardial infarction, stroke, or death, over a three-year follow-up period5 . Notably, nanoplastics were more prevalent than larger microplastics in these plaques6 . Patients with symptomatic carotid artery disease had much higher concentrations of micro- and nanoplastics in their plaques compared to those without symptoms7 .
Exposure to microplastics is universal, occurring through ingestion, inhalation, and skin contact, making it impossible to avoid in modern life8 . Microplastics have been detected not only in plaques but also in other human tissues such as the lungs, liver, placenta, breast milk, urine, and blood9 10. This widespread infiltration underscores the potential for microplastics to influence cardiovascular health adversely.
“Recent research has linked the presence of nanoplastics and microplastics to an increased risk of heart attacks, strokes and early death.”
— Martha Gulati, MD, Cedars-Sinai3
The following list summarizes key findings on microplastics and cardiovascular risk:
- Microplastics were found in about 60% of carotid artery plaques analyzed5 .
- Nanoplastics are more common than microplastics in atherosclerotic plaques6 .
- Patients with microplastics in plaques had a 4.5 times higher risk of heart attack, stroke, or death over three years5 .
- Microplastic levels were 16 times higher in people with plaque but no symptoms and 51 times higher in those who had strokes or related events3 .
- Microplastics can carry toxic substances like pesticides and heavy metals, potentially damaging the cardiovascular system11 .
How Microplastics Contribute to Heart Disease
Microplastics may contribute to cardiovascular disease through several biological mechanisms. These tiny particles can trigger chronic inflammation, oxidative stress, and immune system activation, all of which promote atherosclerosis—the buildup of plaques in arteries8 12. The physical presence of microplastics in plaques may directly provoke pathological processes, including plaque instability and rupture, which can lead to heart attacks and strokes8 .
Plastic additives such as phthalates and bisphenols add to the toxicity by disrupting endocrine and metabolic functions, further exacerbating cardiovascular risk13 . Experimental studies show that microplastic exposure induces inflammatory responses and endothelial dysfunction—the impaired function of the blood vessel lining—which is a key factor in cardiovascular disease development11 12.
Microplastics and nanoplastics may also generate free radicals, unstable molecules that cause cellular damage and apoptosis (cell death), contributing to vascular injury3 . Additionally, these particles can interfere with blood clotting mechanisms, increasing the risk of thrombosis3 .
“Patients with carotid artery plaque in which MNPs were detected had a higher risk of a composite of myocardial infarction, stroke, or death from any cause at 34 months of follow-up than those in whom MNPs were not detected.”
— Raffaele Marfella, M.D., Ph.D. 10
Gene expression studies in plaques with high microplastic content reveal altered activity in stem cells responsible for plaque stability and reduced anti-inflammatory gene expression in macrophages, a type of immune cell7 . This suggests microplastics may weaken the body's natural defenses against plaque progression and rupture.
The following list outlines the main ways microplastics may harm cardiovascular health:
- Triggering chronic inflammation and immune activation in vascular tissues8 .
- Inducing oxidative stress and free radical production leading to cellular damage3 .
- Causing endothelial dysfunction, impairing blood vessel health11 .
- Carrying toxic additives like phthalates and bisphenols that disrupt metabolism13 .
- Altering gene expression related to plaque stability and inflammation7 .
