High cholesterol: causes, risks and treatment options

High cholesterol rarely causes any symptoms, which is exactly why it can go unnoticed for years. Your blood lipid levels nevertheless say a great deal about how much strain your arteries will carry over the coming decades. The encouraging part is that high cholesterol is one of the cardiovascular risk factors you can actually influence. Interpreting the numbers, finding the causes and lowering cholesterol through lifestyle changes or, when needed, medication all belong to one picture that a doctor assesses individually. This guide explains what causes high cholesterol, how risk is evaluated and which treatment options are available.

Cholesterol, LDL, HDL and triglycerides explained

Cholesterol is a fat-like substance the body needs to build cell membranes and to produce hormones and vitamin D. The body also makes cholesterol itself, so the cholesterol you eat is only part of the story. Because cholesterol does not dissolve in water, it travels in the blood inside carrier particles called lipoproteins. The type of carrier largely decides whether the cholesterol it holds is harmful or protective.

LDL cholesterol carries most of the cholesterol in the blood out to the tissues, which is why it is often called "bad" cholesterol. When there is too much LDL cholesterol, it builds up in the walls of the arteries and the narrowing and hardening of the arteries, known as atherosclerosis, progresses. HDL cholesterol works in the opposite direction and carries cholesterol away from the tissues, so it is known as "good" cholesterol. A low HDL level is unfavourable, but raising HDL on its own does not replace lowering LDL.

The third key value is triglycerides, the blood fats that serve as the body's energy store. A fasting triglyceride level above 1.7 mmol/L is considered part of a lipid metabolism disorder. Very high triglycerides can also increase the risk of pancreatitis, an inflammation of the pancreas. For this reason a doctor always looks at triglycerides alongside total cholesterol.

Total cholesterol is the sum of these components. It tells you how much cholesterol there is in the blood overall, but not which carrier particles it is bound to. That is why two people with the same total cholesterol can have very different risk profiles. High cholesterol is therefore best understood as a pattern of several numbers rather than a single figure.

Cholesterol levels: reference values and personal targets

At population level, a total cholesterol below 5.0 mmol/L and an LDL cholesterol below 3.0 mmol/L are generally regarded as healthy. HDL cholesterol is considered low when it is below 1.0 mmol/L in men and below 1.2 mmol/L in women. Reference limits can vary slightly between laboratories, and the range printed next to your result shows the limits that laboratory uses. Some laboratories report results in mg/dL rather than mmol/L, so it is worth checking the unit before comparing numbers.

Your personal target depends on your overall cardiovascular risk rather than on a single cut-off. In commonly used European guidance, a person at low risk aims for LDL below 3.0 mmol/L, mainly through lifestyle. At moderate risk the LDL goal is below 2.6 mmol/L, at high risk below 1.8 mmol/L, and at very high risk below 1.4 mmol/L. Two people with the same reading can still need quite different care, because conditions such as diabetes, previous arterial disease or a strong family history move a person into a higher risk category. Your doctor applies the guidelines used where you live and explains what your own target is.

Doctors sometimes also use non-HDL cholesterol, which is calculated by subtracting HDL cholesterol from total cholesterol. It captures all the cholesterol-carrying particles that put strain on the arteries and is especially useful when triglycerides are raised or when the body does not respond to insulin normally. In addition, measuring lipoprotein(a), or Lp(a), once in a lifetime is usually worthwhile, because it is largely inherited and can raise risk regardless of other values. Interpreting all of these numbers is a job for a doctor who sees them as part of the whole picture.

Causes of high cholesterol

High cholesterol usually has several causes acting at the same time. Diet is one of the most common: saturated fats raise LDL cholesterol, and they are found in fatty dairy products, cheese, fatty processed meats, pastries, pies and biscuits. What matters is not only what you leave out but also what you eat in place of saturated fat. Heredity also has a strong effect on cholesterol levels, and in some people high cholesterol runs in the family regardless of lifestyle.

Lifestyle and general health particularly affect HDL cholesterol and triglycerides. Abdominal obesity and fatty liver can lower HDL cholesterol, and so can physical inactivity and smoking. Heavy drinking can also raise triglycerides. These factors often cluster together with high cholesterol, which is why improving one of them tends to help the others as well.

High cholesterol can also be caused by another illness or circumstance, and it is important to look for these before labelling the problem as purely a lifestyle issue. An underactive thyroid, diabetes, liver and kidney disease, pregnancy and certain medicines can all raise blood lipids. Anabolic steroids sharply lower HDL cholesterol and raise LDL cholesterol. A doctor therefore rules out temporary causes and those linked to other conditions before drawing conclusions about where high cholesterol comes from.

Familial hypercholesterolaemia: inherited high cholesterol

Familial hypercholesterolaemia, or FH, is an inherited condition in which LDL cholesterol is raised from childhood onwards. It is inherited in a dominant pattern, so about half of the children of an affected parent inherit it. The most common cause is a change in the gene for the LDL receptor, which weakens the body's ability to clear LDL cholesterol from the blood. Because FH itself usually causes no symptoms, it is family history and blood tests that bring it to light.

In a typical case of FH, LDL cholesterol is two to three times higher than the usual population level, and the risk of coronary heart disease is many times higher. With this inherited form of high cholesterol, diet and exercise alone are usually not enough, even though they are always part of treatment. FH should be suspected if an adult's total cholesterol is 8 mmol/L or more, if relatives have had early coronary heart disease or sudden cardiac death, or if there are cholesterol deposits in the tendons, called xanthomas. In a child, the suspicion arises when LDL cholesterol is 4 mmol/L or higher.

Recognising FH early matters, because treatment can then start before much fat has built up in the arteries. When FH is found in one family member, close relatives should be tested, starting with siblings, children and parents. Genetic testing can help with this family screening, but a negative result does not always rule FH out, because not every inherited change can be detected. Treatment decisions are ultimately based on LDL cholesterol and overall risk.

Symptoms of high cholesterol

High cholesterol typically causes no noticeable symptoms, and most people only find out about their levels from a blood test. The damage develops gradually as fat accumulates in the artery walls and the arteries narrow. Symptoms appear only when arterial disease has progressed so far that blood flow to the tissues weakens or a blood vessel becomes blocked. Measuring is therefore the only reliable way to find out whether you have high cholesterol.

Advanced arterial disease can cause chest pain on exertion, breathlessness, leg pain when walking or temporary disturbances of speech and vision. These are not symptoms of high cholesterol as such but consequences of arterial disease. In the inherited form, some people develop yellowish deposits on the skin of the eyelids or thickened tendons, for example in the Achilles tendon. The absence of these signs does not mean that your cholesterol is fine.

Risks of high cholesterol and cardiovascular risk assessment

The main harm caused by high cholesterol is atherosclerosis, which increases the risk of heart attack, stroke and peripheral arterial disease in the legs. Risk does not depend on cholesterol alone; its effect grows when other factors are present, such as smoking, high blood pressure, diabetes, excess weight, physical inactivity and early arterial disease in the family. The longer high cholesterol persists, the more fat has time to accumulate in the arteries. That is why paying attention to your levels makes sense even as a young adult, when the danger still feels distant.

When high cholesterol is found, overall risk is assessed by a doctor. If a person already has diagnosed arterial disease or a condition that clearly raises risk, such as diabetes, chronic kidney disease or FH, a separate risk calculation is not needed. For everyone else, a risk calculator estimates the probability of having a heart attack or stroke over the next ten years based on age, sex, smoking, blood pressure and cholesterol values. Risk is then classified as low, moderate, high or very high, and the category determines the LDL target.

Risk calculators can underestimate a young person's lifetime risk, because they only look ten years ahead. When assessing the risk of high cholesterol in younger people, doctors therefore also consider family history and the effect of long-term LDL exposure. If needed, the estimate can be refined with further tests such as an ultrasound of the carotid arteries or a coronary artery calcium score. These are not routine tests, and the need for them is assessed individually.

Cholesterol testing and blood tests

High cholesterol is detected with a blood test called a lipid panel or lipid profile. It usually includes total cholesterol, LDL cholesterol, HDL cholesterol and triglycerides. Fasting is not essential for measuring LDL cholesterol, but it makes triglycerides easier to assess. In practice, your doctor or the laboratory will tell you whether you need to fast for your particular test.

A diagnosis of high cholesterol is usually based on two samples taken on different days, because a single value can vary with illness, lifestyle or recent meals. How often adults should have their lipids checked depends on age, risk factors and local recommendations, so your doctor can advise you on a suitable interval. Testing earlier and more often makes sense if you have risk factors, if cholesterol disorders run in your family or if relatives have had arterial disease at a young age. A doctor may also order blood tests for thyroid function, blood sugar and liver and kidney values, because these can explain raised lipid levels.

Treatment options for high cholesterol

The main aim of treating high cholesterol is to prevent the diseases caused by arterial disease, not simply to bring the numbers down. Treatment is built around overall risk and always includes lifestyle measures, whether or not medication is needed. The treatment options for high cholesterol are dietary changes, physical activity, weight management, stopping smoking and cutting down on alcohol, together with cholesterol-lowering medication when needed. In the inherited form in particular, treatment is also planned together with a specialist.

For people at low or moderate risk, the effect of lifestyle changes is usually followed for a few months before medication is discussed. In a healthy person with no other risk factors and a total cholesterol of 5.0 to 6.4 mmol/L, a new measurement is usually taken three to six months after lifestyle changes have begun. For people at high or very high risk, medication is often started straight away alongside lifestyle changes. The decision is always made individually together with a doctor.

Diet for high cholesterol

For people with high cholesterol, the most important dietary factor is the quality of fat. Partly replacing saturated fats with unsaturated fats is the single most important dietary change for preventing arterial disease. Unsaturated fats come from vegetable oils such as rapeseed oil, which contains only about five percent saturated fat, as well as from fish, nuts and seeds. A common goal is to keep saturated fat below ten percent of daily energy intake.

In practice the changes can be small and fit easily into everyday life. You can choose a plant-oil-based spread instead of butter on bread, a lighter cheese instead of a full-fat one, and fish, chicken or pulses instead of fatty processed meats. Fibre comes from wholegrain products, vegetables, berries and fruit, and a fibre-rich diet supports both cholesterol levels and weight management. Foods and supplements containing plant stanols or sterols can lower cholesterol somewhat, but they are not suitable for everyone, so it is a good idea to discuss them with a health professional first.

Advice on eggs has become less strict than before, but some recommendations suggest that people with high cholesterol themselves or in the family eat around three to four eggs a week. Dietary cholesterol has a smaller effect than saturated fat, so it makes sense to look at the diet as a whole rather than focusing on individual foods. A diet for high cholesterol does not have to be joyless or complicated. If changing your diet feels overwhelming, a dietitian or doctor can help you plan realistic steps.

Exercise, weight, smoking and alcohol

Regular physical activity helps with high cholesterol because it raises HDL cholesterol and at the same time supports weight management, blood pressure and blood sugar. The activity does not have to be strenuous: brisk walking, cycling, swimming or Nordic walking suit many people, as long as enough activity builds up over the week. If you have been inactive or are starting again after a long break, it is wise to progress gradually. Chest pain, shortness of breath or dizziness during exercise is always a reason to stop and see a doctor.

For people who are overweight, losing weight is part of treating high cholesterol, because abdominal obesity and fatty liver lower HDL cholesterol and raise triglycerides. Weight loss can bring HDL back to normal and improve other metabolic values at the same time. Commonly used health goals include a waist circumference below 88 centimetres for women and below 102 centimetres for men, together with a blood pressure below 130/80. Even modest weight loss is beneficial, and the goal does not have to be a perfect weight.

Smoking lowers HDL cholesterol and damages the artery walls, adding to the harm done by high cholesterol, so quitting is one of the most effective ways to reduce your overall risk. The same applies to other nicotine products, which are best avoided. Alcohol is best kept to a minimum, because heavy drinking raises triglycerides and puts strain on the liver. Getting enough sleep and rest is also part of a healthy lifestyle and helps the other changes succeed.

Cholesterol-lowering medication as part of treatment

For high cholesterol, medication becomes an option when lifestyle changes alone do not reach the target, or when overall risk is so high that the target cannot realistically be reached through lifestyle alone. Medication is mainly needed by people at high and very high risk, and in people who already have arterial disease, cholesterol-lowering medication is started alongside lifestyle treatment regardless of their lipid values. Lifestyle treatment always continues while taking medication. Whether medication is needed, which kind and how it is followed up are decided separately for each person on the basis of a doctor's assessment.

There are several groups of cholesterol-lowering medicines, and they work through different mechanisms. Some reduce the liver's production of cholesterol, some reduce the absorption of cholesterol from the gut, and newer injectable treatments given under the skin act on how cholesterol is cleared from the blood. Reaching the target often requires a combination of treatments that work in different ways. The choice depends on factors such as the LDL level being aimed for, other illnesses, other medicines and what suits the individual.

Medication has benefits but also limits and possible side effects. The benefit shows up as fewer cardiovascular events when treatment is continued over the long term, and there is no upper age limit for treatment. The most common side effect is muscle symptoms, while serious muscle problems are rare. The injectable treatments are costlier and are used only in clearly defined situations.

If medication causes symptoms, it should not be stopped on your own; instead, talk to your doctor, who can adjust the treatment. In children, medication is generally used only for inherited cholesterol disorders. During pregnancy and when planning a pregnancy, the suitability of any medication is assessed separately. Medication is not a substitute for diet and exercise, as they work best together, and long-term commitment has the biggest influence on how well treatment succeeds.

Follow-up and long-term success

The aim of follow-up is to make sure LDL cholesterol stays at the target set for your risk category and that other risk factors are under control. After lifestyle changes, levels are usually measured again within a few months, and once treatment has started, follow-up continues as your doctor advises. If triglycerides were within the normal range at diagnosis, measuring LDL cholesterol alone is often enough at follow-up. Follow-up visits also check blood pressure, blood sugar, weight and waist circumference.

Sticking with treatment is essential in the long-term care of high cholesterol, and it is worth paying attention to from the very start. Realistic goals, small steps and keeping track of your own results all help you stay on course. If treatment feels too demanding or side effects appear, say so openly so that the plan can be adjusted. Managing high cholesterol is usually a long-term project rather than a short course.

When to see a doctor

It is a good idea to see a doctor if your cholesterol has never been measured and you are over 40, or earlier if you have risk factors. The same applies if relatives have had an early heart attack or stroke or a known cholesterol disorder. A high reading that has not come down after lifestyle changes is also a reason to get in touch. Together with a doctor you can agree on the tests you need, a risk assessment and a treatment plan.

Urgent help is needed for pressing or squeezing chest pain that spreads to the arm, jaw or back, sudden shortness of breath, sudden weakness on one side of the body, a drooping face, slurred speech or sudden problems with vision. These can be signs of a heart attack or stroke, and you should call your local emergency number straight away (112 in the EU) rather than wait. The speed of treatment has a decisive effect on the outcome.

If you repeatedly get leg pain when walking that eases with rest, have it assessed by a doctor soon. The same applies if you have very high cholesterol, for example a total cholesterol above 8 mmol/L. These situations usually do not require emergency care, but waiting is not a good option either. If you have no symptoms, a regular appointment is enough.

How Dokport can help with high cholesterol

With Dokport you can talk to a doctor quickly and easily when high cholesterol, its risks or a blood test result is on your mind. Over chat, the doctor goes through your situation, including your previous results, family history, lifestyle and other risk factors. The doctor assesses your situation and decides on the appropriate treatment. Dokport is a team that takes good care of people, and our aim is that you come away with a clear understanding of what your numbers mean and what to do next.

If needed, the doctor will refer you for laboratory tests, such as a lipid panel and other blood tests that help clarify your risk, or for further examinations and an in-person visit if your situation calls for it. A remote consultation is not suitable if you have chest pain, signs of a stroke or other urgent symptoms; in those cases call your local emergency number. You can find the price of a consultation in Dokport's current price list. The doctor can also support your lifestyle changes and follow-up over the long term, helping you keep high cholesterol under control.

Summary

High cholesterol is a common and usually symptomless risk factor whose consequences show up years later as arterial disease. How your levels should be interpreted depends on your overall risk, so your target is not the same as someone else's. The foundation of treatment is always lifestyle: the quality of fat in your diet, physical activity, weight management, not smoking and keeping alcohol low. Medication is one treatment option, and a doctor decides individually whether it is needed.

If your levels have never been checked, if early heart disease or stroke runs in your family or if a measured value is high, it is worth looking into with a doctor. High cholesterol can be treated, and consistent long-term follow-up helps protect your arteries. Small everyday changes add up over the years.