Inflammation, Oxidative Stress, and the Aging Cardiovascular System
- Golnosh Sharafsaleh
- May 9
- 9 min read
Many people think of cardiovascular disease as just a cholesterol issue, but it is much more complicated. Factors like chronic inflammation, oxidative stress, immune system activity, metabolic problems, poor sleep, and blood vessel damage all play a role as we age.
For a long time, doctors mainly looked at cholesterol numbers. Cholesterol is still important, but we now know that heart disease is also linked to how the body handles stress, injury, inflammation, and metabolic strain over the years.
Inflammation is not always harmful. It is a normal response that helps the body heal from infections, injuries, and stress. Problems start when inflammation becomes long-lasting and mild but constant. Over time, this can lead to problems such as blood vessel issues, unstable plaque, insulin resistance, stiff arteries, and accelerated aging of the heart and blood vessels.
This helps explain why some people with normal cholesterol still get heart disease, while others with high cholesterol stay healthy for years. What happens inside the body is important.
The Role of Oxidative Stress
To understand oxidative stress, it is useful to know what free radicals are.
Free radicals are unstable molecules that the body naturally makes during normal metabolism. You can picture them as tiny sparks produced when the body generates energy and performs its daily work.
Small amounts of free radicals are normal and can even be helpful. The body has natural defenses, such as antioxidants, that help maintain balance. However, problems develop when there are too many free radicals for the body to handle. When the number of free radicals overwhelms the body’s ability to neutralize them, the imbalance is called oxidative stress.
Over time, oxidative stress can slowly harm cells, blood vessels, proteins, cholesterol, and even DNA. In the heart and blood vessels, this damage can irritate vessel linings, triggering inflammation and plaque buildup.
A key example is LDL cholesterol. When LDL is oxidized, it becomes more likely to trigger inflammation and contribute to plaque formation in the arteries, a process called atherosclerosis.
Many parts of modern life can increase oxidative stress, such as:
chronic psychological stress
poor sleep
smoking
insulin resistance
inactivity
ultra-processed diets
chronic inflammation
excess visceral fat around the abdominal organs
environmental exposures
The body can handle short bursts of stress and recover from them. Trouble starts when stress is constant, and there is not enough time to recover. Over many years, this ongoing strain can accelerate the aging of the heart and blood vessels.
More than just cholesterol testing
Advanced tests for inflammation and oxidative stress can provide more information about what is happening within blood vessels.
hs-CRP (High-Sensitivity C-Reactive Protein)
hs-CRP is one of the most commonly used blood markers for measuring inflammation in the body. CRP stands for C-reactive protein, a protein produced by the liver when the immune system detects inflammation or injury somewhere in the body.
The “high-sensitivity” part of the test simply means the laboratory can detect even small elevations in inflammation that might otherwise go unnoticed.
Inflammation itself is not always harmful. It is part of the body’s normal defense and repair system. If you cut your finger, develop an infection, or injure a muscle, inflammation helps the body heal. The concern develops when inflammation becomes chronic and low-grade, quietly persisting in the background for years.
Researchers now believe this type of chronic inflammation may contribute to many long-term health conditions, including cardiovascular disease, diabetes, cognitive decline, arthritis, and some autoimmune disorders.
hs-CRP is considered a “downstream” inflammatory marker. This means it does not tell us exactly where inflammation is coming from, but rather indicates that the body is responding to an inflammatory signal.
A higher hs-CRP level does not automatically mean someone has heart disease. It simply suggests there may be more inflammation occurring somewhere in the body.
Levels may rise for many reasons, including:
infection
obesity or excess visceral fat
poor sleep
smoking
chronic stress
insulin resistance
autoimmune disease
sedentary lifestyle
chronic inflammatory conditions
Interestingly, many of the same lifestyle patterns that increase cardiovascular risk are also associated with higher levels of chronic inflammation.
This is one reason hs-CRP has become important in cardiovascular medicine. Researchers have found that people with higher hs-CRP levels may have an increased risk of heart attack, stroke, and vascular disease, even when cholesterol levels appear relatively normal.
At the same time, hs-CRP is not a perfect test. Because it reflects general inflammation, levels can temporarily rise from something as simple as a cold, a dental infection, an injury, or a recent illness. This is why hs-CRP should always be interpreted in context and not viewed in isolation.
Rather than focusing on a single number, hs-CRP can be thought of as a broader reflection of the body’s inflammatory environment over time.
IL-6 (Interleukin-6)
IL-6 belongs to a group of proteins called cytokines. Cytokines are chemical messengers that allow immune cells to communicate during events such as infection, injury, stress, and inflammation. Specifically, IL-6 is an inflammatory cytokine, meaning it helps to activate and coordinate the body's inflammatory response. In many ways, cytokines act like alarm signals that alert the immune system to potential problems in the body.
IL-6 is a well-known inflammatory cytokine that plays a role in both short- and long-term inflammation. It has been linked to heart disease, insulin resistance, frailty, muscle loss as people age, and other long-term health problems related to inflammation and stress.
IL-6 is not always harmful. For example, IL-6 levels can go up during exercise as part of the body’s normal recovery process. This shows that inflammation is not just good or bad—it depends on the situation.
Problems usually develop when IL-6 remains elevated for prolonged periods. This can be a sign of ongoing inflammation stemming from stress, metabolic issues, poor sleep, chronic illness, or other long-term strain.
LP-PLA2 (Lipoprotein-Associated Phospholipase A2)
LP-PLA2 is a marker more specifically associated with inflammation within blood vessels. Unlike general inflammatory markers, which can rise from many causes, LP-PLA2 may provide insight into inflammation directly related to the cardiovascular system.
This marker is mostly bound to LDL cholesterol particles, especially those involved in plaque buildup in arteries. LP-PLA2 is produced by inflammatory cells that are often found inside unstable or “vulnerable” plaques that may be more likely to rupture.
As LP-PLA2 interacts with oxidized cholesterol particles, it helps create additional inflammatory substances inside blood vessel walls. Over time, this may contribute to ongoing irritation, inflammation, and progression of atherosclerosis.
One interesting feature of LP-PLA2 is that it appears to reflect a different type of inflammation than markers like hs-CRP. It is less influenced by obesity or generalized inflammation elsewhere in the body and may be more specific to vascular inflammation itself.
Research has shown that higher LP-PLA2 levels are associated with increased risk of coronary artery disease and ischemic stroke, even after accounting for many traditional cardiovascular risk factors.
Like other advanced cardiovascular markers, LP-PLA2 is not meant to replace standard risk assessment, but it may offer additional insight into arterial inflammation.
Myeloperoxidase (MPO)
Myeloperoxidase, or MPO, is made and released by certain white blood cells as part of the body’s immune and inflammation response.
Myeloperoxidase (MPO) is an enzyme. Enzymes speed up specific chemical reactions in the body and are essential for many important processes, such as digestion, energy production, and immune defense. In the case of MPO, this enzyme is produced by certain white blood cells and helps them respond to infection and inflammation by generating reactive molecules to fight pathogens. However, when MPO activity stays elevated over time, it may contribute to oxidative stress and vascular damage.
MPO can damage the arterial lining and help oxidize LDL cholesterol, raising the chance of inflammation and plaque formation.
Higher MPO levels are linked to a greater risk of heart problems and unstable plaque. MPO shows how inflammation, immune activity, and oxidative stress all connect in the heart and blood vessels.
Oxidized LDL (oxLDL)
Most people know about LDL cholesterol, or 'bad cholesterol.' But there is more to the story than just how much LDL is in the blood.
Oxidized LDL means LDL cholesterol that has been damaged by oxidative stress. You can think of oxidation as a kind of 'wear and tear' that changes how these particles act in the body.
When LDL is oxidized, it irritates and inflames blood vessels. These damaged particles are more likely to cause plaque buildup in arteries and can also trigger the immune system inside blood vessel walls.
This is why heart disease is not only about cholesterol. Inflammation, oxidative stress, and the body’s overall environment also affect how cholesterol acts over time.
Things like smoking, ongoing stress, poor sleep, insulin resistance, lack of activity, chronic inflammation, and metabolic problems can all raise oxidative stress and increase oxidized LDL.
oxPL-apoB (Oxidized Phospholipids on ApoB Particles)
This is an advanced heart health marker, and the name may sound complex, but the idea behind it is actually simple.
Phospholipids are fats that help make up the outer layer of cells and cholesterol particles in the blood. When damaged by oxidative stress, they can trigger further inflammation.
oxPL-apoB means oxidized, or damaged, phospholipids attached to some cholesterol particles in the blood. Higher levels may indicate greater inflammation and oxidative stress in blood vessels.
This marker is often mentioned with lipoprotein(a), or Lp(a), which is a cholesterol particle passed down in families and linked to higher heart risk for some people.
Researchers think these oxidized particles can irritate and inflame artery walls, and may help cause plaque to form and become unstable over time.
Testing for these markers is still new and not done for everyone, but they raise an important point: heart disease is not only about cholesterol. Inflammation, oxidative stress, genetics, metabolism, and blood vessel health all work together over time.
Learn more about different types of cholesterol at GeriAcademy
The Bigger Picture
These markers are useful because they look beyond cholesterol. They help us understand inflammation, oxidation, blood vessel injury, and stress in the heart and blood vessels.
Still, no single test can define overall health.
A slightly elevated inflammation marker does not always indicate disease, and a normal result does not guarantee safety. These tests are most helpful when considered along with a person’s symptoms, family history, metabolic health, lifestyle, and overall heart risk. It is important to interpret these test results within the wider clinical context rather than in isolation. The goal is not to become obsessed with inflammatory markers or chase perfect numbers. The goal is to better understand the environment we are creating inside the body over time.
According to the HEALTH Framework, ongoing inflammation and oxidative stress often show a wider loss of the body’s ability to bounce back. The HEALTH Framework is a way to look at whole-person health, centered on key pillars: Healthy eating, Exercise and movement, Adequate rest and recovery, Life balance including stress management, Trusted social connection, and Healthy environment. Together, these areas help the body maintain its capacity to adapt and recover from challenges.
disrupted energy regulation
chronic stress overload
poor sleep quality
loss of muscle mass and activity
metabolic dysfunction
inadequate recovery
persistent inflammatory signaling
The heart and blood vessels often show these changes before any symptoms are noticed.
Health is more than just the absence of disease. It is the body’s ability to adapt, recover, and stay strong over time.
The basics are still important:
sleep
nutrition
movement
muscle preservation
stress regulation
social connection
metabolic health
smoking cessation
recovery and restoration
Advanced tests can provide additional information, but they should not replace the basics that maintain heart health and healthy aging over the long term.
Take This to Your Next Visit: Understanding these markers is the first step toward a more personalized heart health strategy. On your next lab review, don’t just settle for "cholesterol is fine." Ask your provider about advanced markers, such as hs-CRP or oxLDL, to get a clearer picture of your vascular environment.
Disclaimer
This article is intended for educational and informational purposes only and should not be considered medical advice, diagnosis, or treatment. The information provided is meant to help readers better understand cardiovascular inflammation, oxidative stress, and related biomarkers, but it should not replace individualized medical care or professional evaluation.
Laboratory values and cardiovascular risk markers must always be interpreted within the context of a person’s overall health, medical history, symptoms, medications, and risk factors. A single abnormal test result does not diagnose disease, and normal results do not guarantee the absence of disease.
If you have questions about your cardiovascular risk, laboratory testing, or personal health concerns, please discuss them with your doctor or medical team.
References & Further Reading
Bertoia ML, et al. (2013). Oxidation-specific biomarkers and risk of peripheral artery disease. J Am Coll Cardiol. [doi:10.1016/j.jacc.2013.02.047]
Goff DC Jr, et al. (2014). 2013 ACC/AHA guideline on the assessment of cardiovascular risk. J Am Coll Cardiol. [doi:10.1016/j.jacc.2013.11.005]
Holvoet P, et al. (2008). Circulating oxidized LDL and incidence of the Metabolic Syndrome. JAMA. [doi:10.1001/jama.299.19.2287]
Kurt B, et al. (2025). C-reactive protein and cardiovascular risk in the general population. Eur Heart J. [doi:10.1093/eurheartj/ehaf937]
Mensah G, et al. (2026). Inflammation and Cardiovascular Disease: 2025 ACC Scientific Statement. JACC. [doi:10.1016/j.jacc.2025.08.047]
Ndrepepa G. (2019). Myeloperoxidase: A bridge linking inflammation and oxidative stress. Clin Chim Acta. [doi:10.1016/j.cca.2019.02.022]
Pantazi D, et al. (2022). Oxidized phospholipids and Lp-PLA2 in cardiovascular disease. Biofactors. [doi:10.1002/biof.1890]
Rosenson RS, et al. (2025). Oxidized Phospholipids and Systemic Inflammatory Biomarkers (OCEAN-DOSE Trial). JAMA Cardiol. [doi:10.1001/jamacardio.2024.5433]
Zhang N, et al. (2022). Plasma Myeloperoxidase levels and prognosis in heart health. Front Med. [doi:10.3389/fmed.2022.828174]
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