Cholesterol Levels and Long Covid: What You Need to Know

Your cholesterol was fine before COVID. Now your blood test has other ideas. Is there a connection, or is it just an unfortunate coincidence?

Cholesterol levels and Long Covid may be connected, but the science is still evolving. Some studies have found changes in LDL, HDL and other blood fats following COVID infection, while others suggest links between lipid metabolism and prolonged symptoms. Does that mean COVID caused your high cholesterol, or that lowering it could improve Long Covid? Not necessarily. Here’s what researchers have discovered, what your blood tests actually mean and what you can do to protect your heart.

Table of Contents

Key Insights

COVID may affect cholesterol and fat metabolism. Researchers have identified changes in blood-fat markers in some people following infection.
High cholesterol is not a recognised explanation for Long Covid fatigue or brain fog. The relationship is more complicated than that.
LDL, HDL and triglycerides tell different stories. Understanding your results matters more than focusing on total cholesterol alone.
Heart health deserves attention after COVID. Large studies have identified increased cardiovascular risks following infection, although individual risk varies.
You don’t need to exercise through PEM to protect your heart. Diet, appropriate treatment and management of other risk factors still matter.
Be careful with cholesterol supplements. Natural doesn’t automatically mean safer, particularly when supplements have drug-like effects.

Why Are We Talking About Cholesterol and Long Covid?

You’ve been dealing with fatigue, brain fog, strange heart-rate changes and perhaps a collection of symptoms that would require their own filing cabinet.

Then your GP orders a blood test.

And now your cholesterol is high.

Wonderful. Another thing to add to the list.

But before you assume Long Covid has somehow broken your cholesterol, there’s an important question: what does the research actually show?

Scientists have found intriguing links between COVID, blood-fat metabolism and cardiovascular health. Some studies suggest people with prolonged symptoms have different lipid profiles from those who recover more quickly.

But a connection is not the same as a cause.

And cholesterol, unlike many Long Covid symptoms, is something we already know how to measure and manage.

That makes it worth understanding properly.

Can COVID Actually Change Your Cholesterol Levels?

Possibly, yes.

Cholesterol and other fats are part of the body’s normal biology. They help build cell membranes, produce hormones and transport energy.

During infection and inflammation, the way the body produces, transports and processes fats can change.

Scientists call this lipid metabolism.

COVID may affect these processes through inflammatory responses, changes in liver metabolism and other biological pathways. However, the direction and persistence of lipid changes vary between individuals and studies.

Some research has identified lower HDL cholesterol, altered triglycerides or changes in other lipid-related markers during or after COVID.

What remains less clear is whether these changes are a direct consequence of infection, reflect pre-existing metabolic health, or are influenced by factors such as medication, weight changes, diet and reduced activity.

The answer may involve several factors at once.

What Did the King’s College London Study Find?

In 2022, researchers associated with King’s College London and the ZOE Health Study examined blood markers from 4,787 people.

They found that participants with less favourable levels of certain blood fats were more likely to report prolonged symptoms following illness.

Interestingly, the association was not limited to COVID. Similar patterns appeared among people with prolonged symptoms after other illnesses.

That makes the finding more interesting, but also more complicated.

It suggests that metabolic health may be related to how people experience or recover from illness. It does not establish that cholesterol changes are specific to Long Covid or that high LDL directly causes persistent symptoms.

Read the King’s College London research summary.

The takeaway: Researchers have identified a relationship worth investigating. They haven’t discovered a cholesterol-based cure for Long Covid.

LDL, HDL and Triglycerides: What Do They Actually Mean?

A cholesterol blood test can feel like a collection of abbreviations designed by someone who doesn’t particularly enjoy explaining things.

Here’s the useful version.

Blood-test result	What it means	Why it matters
Total cholesterol	Overall cholesterol in your blood	Useful starting point, but doesn’t tell the whole story
LDL cholesterol	Carries cholesterol to tissues	Higher levels contribute to artery plaque formation over time
HDL cholesterol	Helps transport cholesterol away from tissues	Lower levels can be associated with increased cardiovascular risk
Non-HDL cholesterol	Total cholesterol minus HDL	Captures several types of cholesterol-carrying particles associated with cardiovascular risk
Triglycerides	A form of fat used for energy storage	High levels may accompany metabolic problems; very high levels can increase pancreatitis risk
ApoB	A protein on potentially artery-damaging lipoprotein particles	Can provide additional information about particle-related cardiovascular risk in selected situations

You’ve probably heard LDL called “bad cholesterol” and HDL called “good cholesterol”.

That’s useful shorthand, but biology is rarely quite so polite.

For example, having high HDL doesn’t automatically cancel out the risks of high LDL. And cholesterol treatment generally focuses on lowering harmful lipoproteins rather than simply trying to raise HDL.

What Cholesterol Numbers Should You Look For?

For adults without established cardiovascular disease, commonly used UK general guide values include:

Measurement	General guide
Total cholesterol	Below 5 mmol/L
Non-HDL cholesterol	Below 4 mmol/L
HDL cholesterol	Above 1.0 mmol/L for men and 1.2 mmol/L for women
Fasting triglycerides	Below 1.7 mmol/L
Non-fasting triglycerides	Below 2.3 mmol/L

These are general reference values, not personalised treatment targets. Someone with established cardiovascular disease, familial hypercholesterolaemia or other important risk factors may need substantially lower LDL or non-HDL levels.

Your overall risk matters more than a single number.

Can High Cholesterol Cause Long Covid Fatigue, Brain Fog or Breathlessness?

This is where we need to be particularly careful.

High LDL cholesterol generally doesn’t produce obvious day-to-day symptoms. You cannot usually feel your cholesterol rising.

So if you’re experiencing severe fatigue, breathlessness or brain fog, an elevated LDL result should not automatically be presented as the explanation.

There are several important distinctions.

Fatigue

Long Covid fatigue may involve PEM, autonomic dysfunction, sleep problems and other mechanisms.

High cholesterol itself is not an established cause of Long Covid fatigue.

However, metabolic conditions that sometimes accompany abnormal cholesterol — such as diabetes or thyroid disease — can contribute to fatigue and deserve appropriate investigation.

Brain fog

Researchers are studying vascular, inflammatory, neurological and metabolic contributors to cognitive symptoms after COVID.

Although lipid abnormalities are associated with cardiovascular and cerebrovascular risk, there is not enough evidence to conclude that correcting cholesterol will resolve Long Covid brain fog.

Chest pain and breathlessness

High cholesterol contributes to atherosclerotic cardiovascular disease over time.

But post-COVID chest pain and breathlessness can have many other causes, including heart or lung disease, dysautonomia, breathing-pattern disorders and post-exertional malaise.

New or worsening symptoms need proper assessment.

The important distinction: Cholesterol may be relevant to long-term cardiovascular risk without being the immediate explanation for your Long Covid symptoms.

Does Long Covid Increase Your Risk of Heart Disease?

COVID infection has been associated with increased cardiovascular risks in large observational studies.

A major 2022 study published in Nature Medicine analysed healthcare records from more than 150,000 people with COVID, comparing them with large control groups.

Researchers identified increased risks of several cardiovascular conditions during the following year, including arrhythmias, ischaemic heart disease, heart failure and thromboembolic disorders.

The findings were not restricted to people who had been hospitalised, although risks were generally greater after more severe acute illness.

However, this was an observational study using US Veterans Affairs data. Its population was not representative of every age group or demographic, and it cannot establish the exact mechanism behind every outcome.

Read the full Nature Medicine study.

This research supports taking cardiovascular symptoms and established risk factors seriously after COVID.

It does not mean everyone with Long Covid has heart disease, nor that cholesterol is responsible for all post-COVID cardiovascular complications.

For more background, explore our article on COVID, blood vessels and microvascular dysfunction.

My Cholesterol Was Normal Before COVID. Why Might It Be Higher Now?

If your results have changed, COVID may be one possible contributor — but it shouldn’t be the only explanation considered.

Several everyday factors can affect cholesterol levels.

Reduced activity: Being less physically active may affect triglycerides, HDL and metabolic health, although the response varies.

Changes in eating habits: Illness can make cooking difficult. Sometimes convenience food becomes less of a choice and more of a survival strategy.

Weight changes: Weight gain or loss can affect lipid measurements.

Hormonal changes: Menopause and thyroid disorders can influence cholesterol levels.

Medication: Some treatments, including certain corticosteroids, can affect lipid metabolism.

Pre-existing risk: Family history and inherited lipid disorders may become apparent when testing is performed for another reason.

This is why comparing results from before and after infection can be useful, but doesn’t prove COVID caused the change.

Should You Ask Your GP for a Cholesterol Test After COVID?

Not everyone with Long Covid automatically needs repeated cholesterol testing.

But it may be reasonable to discuss a lipid profile if you’ve developed new cardiovascular risk factors, have a family history of early heart disease, previously had abnormal cholesterol, or haven’t had your cardiovascular risk assessed when appropriate.

A full lipid profile typically includes total cholesterol, HDL cholesterol and triglycerides, with LDL and non-HDL cholesterol calculated.

In the UK, fasting is not routinely required.

Your GP may also consider blood pressure, diabetes risk, thyroid function and other factors depending on your history.

UK NICE guidance on cardiovascular risk and lipid management explains how cholesterol results should be interpreted alongside broader cardiovascular risk.

Five Questions Worth Asking Your GP

Has my cholesterol changed significantly compared with previous results?
Which result matters most in my case LDL, non-HDL cholesterol or triglycerides?
Could medication, thyroid function, menopause or another condition be contributing?
What is my overall cardiovascular risk, and does my medical history change the assessment?
Would lifestyle changes, medication or repeat testing be appropriate?

You don’t need to arrive with a medical degree. Just enough information to have a useful conversation.

How Can You Improve Cholesterol When You Have Long Covid?

Standard cholesterol advice often includes exercising more.

For someone with Long Covid and post-exertional malaise, that’s not always helpful.

Being told to go for a brisk walk when walking to the bathroom can trigger a two-day crash is hardly a practical plan.

Fortunately, cholesterol management involves much more than exercise.

1. Focus on Food Changes That Are Actually Manageable

You don’t need an elaborate diet or a cupboard full of expensive superfoods.

Evidence-based dietary approaches include replacing some saturated fats with unsaturated fats and increasing soluble fibre.

Useful examples include oats, beans, lentils, vegetables, nuts, olive oil and oily fish.

If you’re dealing with severe fatigue, simple changes count.

Porridge instead of a more saturated-fat-heavy breakfast. A handful of nuts instead of certain processed snacks. Tinned beans added to a meal.

No complicated recipe required.

2. Don’t Push Through PEM to Improve Your Numbers

Physical activity can improve cardiovascular health, but PEM requires a different approach.

If exertion triggers delayed worsening of symptoms, increasing activity according to a fixed schedule may be inappropriate.

Pacing helps people manage their available energy and reduce repeated crashes.

Read our guide to pacing and energy management.

If your mobility is significantly limited, ask your healthcare team how to manage cardiovascular risk without aggravating symptoms.

3. Address Other Risk Factors

Blood pressure, smoking, diabetes, kidney disease, family history and other factors all contribute to cardiovascular risk.

For some people, managing these may be as important as the cholesterol result itself.

4. Discuss Medication When Appropriate

Statins are established treatments for lowering LDL cholesterol and reducing cardiovascular events in people who meet treatment criteria.

Other medications, including ezetimibe and certain injectable treatments, may be appropriate in selected cases.

But cholesterol-lowering medication is not an established treatment for Long Covid itself.

The reason to prescribe it should be based on cardiovascular risk and recognised clinical indications, not simply the presence of persistent post-COVID symptoms.

What About Berberine and Red Yeast Rice?

Supplements are frequently promoted as natural alternatives to cholesterol medication.

Unfortunately, “natural” doesn’t automatically mean gentle, predictable or free from interactions.

Berberine

Berberine is a plant-derived compound studied for effects on blood glucose and lipid metabolism.

Some studies suggest modest improvements in certain metabolic markers, but research quality and formulations vary.

It can cause gastrointestinal side effects and interact with medications. There is no convincing clinical evidence that berberine treats Long Covid.

It shouldn’t replace prescribed cholesterol treatment without medical advice. Berberine is also covered in our guide to herbal medicines for Long Covid, including its possible metabolic effects and important drug interactions.

Red Yeast Rice

Red yeast rice deserves particular caution.

Some products contain monacolin K, chemically identical to the prescription statin lovastatin.

That means it may produce statin-like effects, including drug interactions and muscle or liver adverse effects.

The amount of active compound can also vary dramatically between products.

A study analysing 28 brands found substantial differences in monacolin K content.

Read the study on red yeast rice variability.

European food-safety assessments have also raised concerns about adverse effects associated with monacolins.

The practical takeaway: If you need cholesterol treatment, a regulated medication with a known dose and appropriate monitoring is generally a more reliable discussion to have with your clinician than experimenting with red yeast rice.

Can Lowering Cholesterol Improve Long Covid?

At present, there is no good evidence that lowering LDL cholesterol by itself resolves Long Covid.

That doesn’t mean treating high cholesterol is pointless.

Lowering elevated LDL can reduce long-term cardiovascular risk in appropriate patients, even if fatigue, brain fog or PEM remain unchanged.

These are two separate goals:

Treating cardiovascular risk means reducing the likelihood of future heart and blood-vessel disease.

Treating Long Covid means addressing the mechanisms and symptoms responsible for the post-viral illness.

Sometimes those goals overlap. Sometimes they don’t.

Recognising the difference prevents false promises while still allowing useful treatment. For a broader look at which medications and supplements have meaningful evidence, see our Long Covid Treatments guide

When Should You Be Concerned?

An abnormal cholesterol result is usually not an emergency, but certain findings deserve prompt medical review.

Very high LDL or total cholesterol may suggest an inherited lipid disorder. Markedly elevated triglycerides may require more urgent assessment because of pancreatitis risk.

New chest pain, sudden breathlessness, fainting or neurological symptoms should not be dismissed as cholesterol or Long Covid.

Seek urgent medical assessment when appropriate, and emergency help for severe or potentially life-threatening symptoms.

The Bigger Picture: What Cholesterol Research Might Tell Us About Long Covid

The most interesting part of this research isn’t necessarily whether someone has slightly higher LDL after COVID.

It’s what altered lipid metabolism might reveal about the wider biology of prolonged illness.

Lipids are involved in cell membranes, immune signalling and energy regulation. Researchers are investigating how infection-related changes in these systems may contribute to persistent symptoms.

This connects with broader Long Covid research into inflammation, vascular dysfunction, immune dysregulation and cellular metabolism.

But a research finding isn’t automatically a treatment target.

Before cholesterol or other lipid markers can become reliable Long Covid biomarkers, scientists need to establish whether the findings are reproducible, specific enough to be useful and meaningfully connected to disease mechanisms.

That’s an important difference between an interesting biological clue and a clinically useful test.

Final Thoughts: Another Piece of the Puzzle, Not the Whole Picture

Long Covid has a remarkable talent for turning ordinary health questions into complicated ones.

A cholesterol result is no exception.

Research suggests that COVID and prolonged post-viral illness may be associated with changes in blood-fat metabolism. But that doesn’t mean every abnormal result was caused by infection, or that cholesterol is the hidden explanation for fatigue, brain fog and breathlessness.

What we do know is that cardiovascular health matters.

And unlike many unanswered questions in Long Covid, elevated cholesterol is something clinicians can assess and, when appropriate, treat.

So if your cholesterol has changed, don’t panic — but don’t ignore it either.

Treat the risk we understand, keep investigating the illness we don’t fully understand, and don’t confuse the two.

Frequently Asked Questions

Can Long Covid cause high cholesterol?

Some studies have found associations between prolonged post-COVID symptoms and abnormal blood-fat markers. However, researchers have not established that Long Covid directly causes high cholesterol in every affected person.

Can COVID lower good HDL cholesterol?

Changes in HDL cholesterol have been reported during and after COVID in some studies. The pattern varies, and a low HDL result can also reflect metabolic health and other factors unrelated to infection.

Does high cholesterol cause Long Covid fatigue?

High cholesterol itself is not an established cause of Long Covid fatigue. PEM, autonomic dysfunction, sleep problems and other conditions may contribute. Abnormal cholesterol should be assessed separately.

Should I get my cholesterol checked if I have Long Covid?

A lipid profile may be appropriate depending on your age, cardiovascular risk, family history and previous results. Long Covid alone does not mean everyone needs repeated testing.

Do I need to fast for a cholesterol blood test?

Usually not. UK guidance allows a non-fasting full lipid profile for routine assessment. Fasting may be requested in specific situations, particularly when triglycerides are very high.

Can statins treat Long Covid?

Statins are established treatments for reducing cardiovascular risk, but they are not currently proven treatments for Long Covid itself. Decisions about prescribing should follow recognised clinical indications.

Can I lower cholesterol without exercising?

Yes. Dietary changes and, where appropriate, medication can lower cholesterol. People with PEM should not be encouraged to push through symptom crashes simply to meet exercise targets.

Is red yeast rice safer than statins?

Not necessarily. Some red yeast rice products contain a compound identical to lovastatin, with potential drug interactions and adverse effects. Active ingredient levels can vary substantially.

Does normal cholesterol mean my heart is fine after COVID?

No. Cholesterol is only one part of cardiovascular assessment. Symptoms, blood pressure, medical history and other investigations may still matter.

Research and References

King’s College London — Unhealthy Cholesterol Linked to Long COVID and Other Prolonged Illnesses (2022) — Research involving 4,787 participants and associations between blood-fat markers and prolonged symptoms.
Xie et al., Nature Medicine (2022) — Long-Term Cardiovascular Outcomes of COVID-19 — Large observational study examining cardiovascular outcomes after infection.
NICE NG238 — Cardiovascular Disease: Risk Assessment and Reduction — UK recommendations on lipid testing, cardiovascular risk and treatment.
Cohen et al. (2017) — Variability in Strength of Red Yeast Rice Supplements — Analysis of differences in active ingredient content between products.
EFSA — Scientific Opinion on the Safety of Monacolins in Red Yeast Rice — Safety concerns involving statin-like compounds.

Disclaimer

This article is for educational purposes only and does not replace personalised medical advice. Cholesterol results should be interpreted alongside your medical history and cardiovascular risk. Consult a qualified healthcare professional before starting, stopping or changing medications or supplements.

Last reviewed and updated: October 2026.