Chronic inflammation and what blood tests can reveal

With February marking National Heart Month, it’s a good time to talk about chronic inflammation. While short-term inflammation is a normal and helpful response to injury or infection, chronic inflammation is a low-level, ongoing state that can gradually affect the body over time, often without obvious symptoms at first.

At EssexPrivateGP, we often see patients who feel generally unwell or run-down without a clear cause. In many cases, targeted blood tests can provide valuable insight into whether inflammation may be playing a role.

What is chronic inflammation?

Inflammation becomes a problem when it doesn’t switch off. Instead of resolving once the body has dealt with a threat, chronic inflammation lingers, subtly damaging tissues and organs over time. Research has linked this ongoing inflammatory state to a wide range of conditions, including cardiovascular disease, type 2 diabetes, autoimmune disorders, and persistent fatigue.

When it comes to heart health, inflammation is particularly important. It contributes to the development of atherosclerosis, where fatty plaques build up in the arteries. These plaques can become unstable, increasing the risk of heart attack or stroke. This is one of the reasons inflammation is now considered a key factor in cardiovascular risk, alongside cholesterol and blood pressure.

Chronic inflammation can also affect how the immune system behaves, sometimes leading it to become overactive or misdirected. This can worsen autoimmune conditions or leave you feeling constantly tired, achy, or foggy headed.

Chronic inflammation and Long Covid

We are also seeing increasing evidence that chronic inflammation may play a role in Long Covid, a condition where symptoms persist for months after the initial infection. Many people with Long Covid report ongoing fatigue, brain fog, muscle aches, and a general sense of being unwell, even when standard tests appear normal.

A recent study published in Nature Immunology found ongoing immune activation and inflammatory changes in some people with Long Covid, helping to explain why symptoms can be prolonged and difficult to pin down. Blood tests that assess inflammation and immune activity can be a useful starting point.

What blood tests can tell us

One of the challenges with chronic inflammation is that symptoms are often vague. People may report low energy, joint discomfort, frequent infections, or difficulty managing weight, without a clear explanation. This is where blood tests can be especially helpful.

Markers such as C-reactive protein (CRP) are commonly used to assess inflammation levels in the body. Elevated CRP doesn’t point to a specific diagnosis on its own, but it can signal that something inflammatory is going on and that further investigation is needed.

Other blood tests may assess immune activity, metabolic health, blood glucose, and lipid levels, all of which can be influenced by chronic inflammation.

At EssexPrivateGP, private health checks allow us to look at the bigger picture. We consider how inflammation markers sit alongside cholesterol, blood pressure, and glucose levels, as well as family history and lifestyle. This holistic approach helps identify early warning signs and opens the door to preventative action before more serious problems develop.

Reducing inflammation with lifestyle changes

The encouraging news is that chronic inflammation is often modifiable. Diet, activity levels, sleep quality, and stress, all influence inflammatory processes in the body. The British Heart Foundation clearly highlights the role of diet in managing inflammation and reducing heart disease risk, recommending a pattern of eating that includes plenty of vegetables, fruits, whole grains, oily fish, nuts, seeds, and healthy fats such as olive oil. Take a look at the BHF guidance here.

Regular physical activity also plays a protective role, helping regulate metabolism and reduce inflammatory markers over time. Consistent movement such as walking is often enough to make a difference. Sleep is another key factor. Poor or disrupted sleep increases inflammation, while good-quality rest supports immune balance and recovery.

Stress management matters too, which is why mindfulness, breathing techniques, and time spent outdoors are increasingly recognised as important parts of preventative health.

If you’re experiencing ongoing fatigue, unexplained symptoms, or want a clearer picture of your heart and metabolic health, book a Well Person Health Check at EssexPrivateGP.