Reactive Oxygen Species (ROS) are often described as harmful “free radicals.” While excessive ROS can damage cells, they are not inherently bad. In fact, they are essential signalling molecules required for immune defence, cellular communication, and tissue repair.

The problem begins when ROS production overwhelms the body’s antioxidant defence system — a condition known as oxidative stress.

Today, mounting evidence suggests that chronic oxidative stress and persistent low-grade inflammation are central drivers of modern chronic diseases, including obesity, cardiovascular disease, neurodegeneration, and cancer.

Why ROS Matter

At physiological levels, ROS:

• Help immune cells destroy pathogens
• Regulate gene expression
• Participate in wound healing
• Maintain cellular signalling balance

However, when ROS accumulate excessively due to poor diet, sleep deprivation, environmental toxins, metabolic dysfunction, or chronic stress, they can:

• Damage DNA
• Oxidize lipids (lipid peroxidation)
• Impair mitochondrial function
• Trigger chronic inflammation

This persistent inflammatory state becomes the foundation upon which many chronic diseases develop.

Chronic Inflammation: The Real Culprit

While ROS initiate oxidative stress, chronic inflammation sustains disease progression.

Excess ROS activate inflammatory pathways such as NF-κB and cytokine cascades, creating a self-perpetuating cycle:

Oxidative stress → Inflammation → More ROS → Tissue damage

Over time, this cycle contributes to:

• Insulin resistance and obesity
• Atherosclerosis
• Neurodegenerative disorders
• Tumor microenvironment activation

In oncology research, oxidative stress is recognized as a key factor in DNA mutation and tumor progression, although cancer cells also exploit ROS for growth signaling.

TCM Interpretation: Phases of Inflammation

Within Traditional Chinese Medicine (TCM), the biological state characterized by persistent oxidative and inflammatory burden shows meaningful functional parallels with several classical pathomechanisms.

• Excessive ROS and inflammatory activity resemble heat toxin” and “toxic accumulation (热毒、毒邪内蕴) described in classical literature. The Huangdi Neijingemphasizes that prolonged internal pathogenic factors can gradually damage the zang-fu and consume upright qi.
• The slow and often clinically silent progression of low-grade inflammation parallels the concept of latent pathogen (伏邪). This reflects the modern observation that metabolic inflammation may remain subclinical for years.
• Declining antioxidant capacity and mitochondrial dysfunction may be viewed through the lens of upright qi deficiency (正气虚). The Neijingstates: “正气存内，邪不可干,” highlighting the importance of internal resilience in disease prevention.
• Finally, microcirculatory impairment and chronic tissue injury overlap conceptually with blood stasis with toxin (瘀毒互结), a pattern frequently discussed in modern TCM oncology and chronic disease management.

Common herbal strategies that demonstrate antioxidative and anti-inflammatory effects include:

• 黄芪 (Astragalus membranaceus)– immune modulation, mitochondrial protection
• 丹参 (Salvia miltiorrhiza)– microcirculation and endothelial protection
• 灵芝 (Ganoderma lucidum)– immune and oxidative stress regulation
• 姜黄 (Curcuma longa)– NF-κB modulation
• 人参 (Panax ginseng)– metabolic and mitochondrial support

Modern pharmacological studies increasingly validate their roles in redox balance and inflammatory modulation.

Practical Health Strategies

Because ROS are both necessary and potentially harmful, the goal is balance, not elimination.

Evidence-supported lifestyle measures include:

• A plant-rich diet (especially green leafy vegetables and polyphenol-rich foods)
• Adequate sleep (7–8 hours nightly to restore antioxidant capacity)
• Moderate sunlight exposure (circadian and mitochondrial regulation)
• Regular physical activity (improves mitochondrial efficiency)
• Stress reduction practices

It is worth mentioning that over-supplementation with high-dose synthetic antioxidants is not universally beneficial and may even blunt physiological signaling.

References

• Roles of Reactive Oxygen Species in Inflammation and Cancer – a 2024 comprehensive review on ROS signalling in inflammation and tumorigenesis
• ROS and the DNA Damage Response in Cancer – review highlighting ROS impact on DNA damage and therapy response (2018)
• Astragalus and Its Formulas as Therapeutic Options – 2022 review summarising Astragalus anti-oxidative and anti-inflammatory pathways across multiple disease models