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Harmful Effects of Microplastics and Nanoplastics in Human Body Systems: A Systematic Review
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A new review of 30 studies found that tiny plastic particles called microplastics are now widespread in human bodies, showing up in blood, lungs, and other organs. Higher levels of these plastic particles were linked to more severe disease in the heart, lungs, digestive system, and reproductive organs. This research suggests that the plastic pollution around us may be harming our health, though more studies are needed to prove these plastics directly cause disease.
Background: Microplastics and nanoplastics (MNPs) are ubiquitous environmental contaminants from plastic degradation, leading to human exposure through ingestion, inhalation, and dermal contact. While emerging evidence suggests potential health effects, comprehensive human-specific data remain limited. Objective: To systematically review evidence on MNP exposure and health impacts across human organ systems. Methods: Following PRISMA guidelines, we searched Embase, Environment Complete, MEDLINE, and Scopus for peer-reviewed English-language studies published between 2020 and 2025 that reported MNP exposure in adult human populations and addressed at least one organ system. Thirty studies met inclusion criteria, and all clinical studies were assessed for risk of bias using the Newcastle–Ottawa Scale (NOS) Results: Clinical studies consistently detected MNPs in human blood, thrombi, feces, and respiratory and reproductive tissues. Higher MNP burdens correlated with increased disease severity across cardiovascular, gastrointestinal, respiratory, musculoskeletal, and reproductive systems. In vitro studies using human-derived cell lines demonstrated that MNPs penetrate cells and disrupt cellular processes, inducing oxidative stress, cytotoxicity, mitochondrial dysfunction, inflammation, DNA damage, and apoptosis. Toxic effects were size-, polymer-, and concentration-dependent, with smaller particles exhibiting greater cellular uptake and toxicity. Conclusions: Human MNP exposure is widespread and associated with adverse biological effects across multiple organ systems. Further interdisciplinary research is needed to establish causal relationships and inform risk assessment and regulatory frameworks for plastic-associated contaminants. Other: This research received no external funding. The research protocol was registered with PROSPERO (Registration ID number CRD420261284559).
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This review pulled together 25 studies confirming that tiny plastic particles (microplastics and nanoplastics) have been found throughout the human body—in blood, lungs, organs, and even placental tissue—showing these particles can travel and build up inside us. However, researchers still don't fully understand what health effects this buildup causes, largely because studies use inconsistent methods to detect and measure these particles, so more standardized research is urgently needed before we can say exactly how worried we should be.
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This review of existing research found that tiny plastic particles (called microplastics and nanoplastics) build up in different parts of the human body and may cause inflammation and organ problems. However, the studies had different methods and limitations, so scientists can't yet prove these plastics directly cause health issues. Better long-term studies are needed to understand if microplastics - which come from things like plastic bottles and food packaging - truly harm human health.
Systemic Accumulation and Distribution of Micro- and Nanoplastics in Human Tissues and Their Impact on Health: A Systematic Review
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This systematic review synthesizes human evidence on the presence of micro- and nanoplastics in body tissues and fluids, including blood, lungs, placenta, breast milk, and liver. The research confirms that plastic particles can cross biological barriers and accumulate in multiple organ systems. While the long-term health effects are still being studied, the widespread presence of plastics inside the human body raises significant health concerns.
Microplastics in the Human Body
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Tiny plastic particles called microplastics get into our bodies through the food we eat, the air we breathe, and even through our skin—and this review of a decade of research shows they've been found in our blood, lungs, reproductive organs, and even the placentas of pregnant women. Scientists are concerned because these particles may trigger cell damage, immune problems, and hormone disruption, though more research is needed to fully understand the risks. The good news: researchers are exploring solutions, from better regulations to new technologies that break down plastic waste before it becomes a problem.
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