High cholesterol is a pretty common issue in the U.S. In fact, according to the Centers for Disease Control and Prevention (CDC), nearly 94 million U.S. adults ages 20 or older have what could be considered borderline high cholesterol.

However, because this condition can often present without any real symptoms, you may not even know you have it until you visit your doctor.

If you’re wondering what causes high cholesterol, what to do if you’ve been diagnosed with it, and if there are ways to reverse it (hint: there are), read on for all the answers.

Cholesterol is a type of lipid. It’s a waxy, fat-like substance that your liver produces naturally. It’s vital for the formation of cell membranes, certain hormones, and vitamin D.

Cholesterol doesn’t dissolve in water, so it can’t travel through your blood on its own. To help transport cholesterol, your liver produces lipoproteins.

Lipoproteins are particles made from fat and protein. They carry cholesterol and triglycerides, another type of lipid, through your bloodstream. The two major forms of lipoprotein are low-density lipoprotein (LDL) and high-density lipoprotein (HDL).

LDL cholesterol is any cholesterol carried by low-density lipoproteins. If your blood contains too much LDL cholesterol, you may be diagnosed with high cholesterol. Without treatment, high cholesterol may lead to many health issues, including heart attack and stroke.

High cholesterol rarely causes symptoms in the beginning. That’s why it’s important to get your cholesterol levels checked on a regular basis.

In most cases, high cholesterol is a “silent” condition. It typically doesn’t cause any symptoms. Many people don’t even realize they have high cholesterol until they develop serious complications, such as a heart attack or stroke.

That’s why routine cholesterol screening is important. If you’re 20 years or older, ask your doctor if you should have routine cholesterol screening.

Eating too many foods that are high in cholesterol, saturated fats, and trans fats may increase your risk of developing high cholesterol. Living with obesity can also increase your risk. Other lifestyle factors that can contribute to high cholesterol include inactivity and smoking.

Your genetics can also affect your chances of developing high cholesterol. Genes are passed down from parents to children. Certain genes instruct your body on how to process cholesterol and fats. If your parents have high cholesterol, you may be at a greater risk of having it too.

In rare cases, high cholesterol is caused by familial hypercholesterolemia. This genetic disorder prevents your body from removing LDL. According to the National Human Genome Research Institute, most adults with this condition have total cholesterol levels above 300 milligrams per deciliter and LDL levels above 200 milligrams per deciliter.

Other health conditions, such as diabetes and hypothyroidism, may also increase your risk of developing high cholesterol and related complications.

LDL cholesterol is often called “bad cholesterol.” It carries cholesterol to your arteries. If your levels of LDL cholesterol are too high, it can build up on the walls of your arteries.

This buildup is also known as cholesterol plaque. This plaque can narrow your arteries, limit your blood flow, and raise your risk of blood clots. If a blood clot blocks an artery in your heart or brain, it can cause a heart attack or stroke.

HDL cholesterol is sometimes called “good cholesterol.” It helps return LDL cholesterol to your liver to be removed from your body. This helps prevent cholesterol plaque from building up in your arteries.

When you have healthy levels of HDL cholesterol, it can help lower your risk of blood clots, heart disease, and stroke.

Triglycerides are another type of lipid. They’re different from cholesterol. While your body uses cholesterol to build cells and certain hormones, it uses triglycerides as a source of energy.

When you eat more calories than your body can use right away, it converts those calories into triglycerides. It stores triglycerides in your fat cells. It also uses lipoproteins to circulate triglycerides through your bloodstream.

If you regularly eat more calories than your body can use, your triglyceride levels may become too high. This can raise your risk of several health problems, including heart disease and stroke.

Your doctor can use a simple blood test to measure your triglyceride level, as well as your cholesterol levels.

If you’re 20 years or older, the American Heart Association recommends getting your cholesterol levels checked at least once every 4 to 6 years. If you have a history of high cholesterol or other risk factors for cardiovascular disease, your doctor may encourage you to get your cholesterol levels tested more often.

Your doctor can use a lipid panel to measure your total cholesterol level, as well your LDL cholesterol, HDL cholesterol, and triglyceride levels. Your total cholesterol level is the overall amount of cholesterol in your blood. It includes LDL and HDL cholesterol.

If your levels of total cholesterol or LDL cholesterol are too high, your doctor may diagnose you with high cholesterol. High cholesterol can be dangerous when your LDL levels are too high and your HDL levels are too low.

Cholesterol levels chart

Being diagnosed with high cholesterol doesn’t automatically mean you will be put on medication. If your doctor does prescribe you medication, different factors may influence the type of medication they recommend.

With this in mind, most physicians use generalized measurements to decide on treatment plans. They may categorize these measurements as desirable, borderline high, or high cholesterol.

According to the National Library of Medicine, the total cholesterol of most adults can be categorized as:

Total cholesterolCategory
less than 200 mg/dLdesirable
200-239 mg/dLborderline high
240 mg/dL and abovehigh

The National Library of Medicine also provides optimal to high categories of LDL (“bad”) cholesterol levels:

LDL (“bad”) cholesterol levelsCategory
less than 100 mg/dLoptimal
100-129 mg/dL near optimal
130-159 mg/dLborderline high
160-189 mg/dLhigh
190 mg/dL and abovevery high

Again, these measurements are general. You and your doctor will consider other personal factors before deciding on a treatment plan.

Your body needs some cholesterol to function properly, including some LDL. But if your LDL levels are too high, it can raise your risk of serious health problems.

In 2018, the American College of Cardiologists and the American Heart Association updated their recommendations for the treatment of high cholesterol.

Under the new guidelines, in addition to your cholesterol levels, treatment recommendations analyze other risk factors for heart disease, such as family history and other health issues. The guidelines use all these factors to consider a person’s overall chance of developing complications during the next 10 years.

You may be at a higher risk of developing high cholesterol if you:

  • are living with obesity
  • consume a lot of saturated and trans fats, like those found in fast food
  • have limited physical activity
  • smoke tobacco products
  • have a family history of high cholesterol
  • have diabetes, kidney disease, or hypothyroidism

People of all ages, genders, and ethnicities can have high cholesterol.

Without treatment, high cholesterol can cause plaque to build up in your arteries. Over time, this plaque can narrow your arteries. This condition is known as atherosclerosis.

Atherosclerosis is a serious condition. It can limit the flow of blood through your arteries. It also raises your risk of developing dangerous blood clots.

Atherosclerosis can result in many life threatening complications, such as:

High cholesterol can also create a bile imbalance, raising your risk of gallstones.

If you have high cholesterol, your doctor may recommend lifestyle changes to help lower it. For instance, they may recommend changes to your diet, exercise habits, or other aspects of your daily routine. If you smoke, they will likely advise you to quit.

Your doctor may also prescribe medications or other treatments to help lower your cholesterol levels. In some cases, they may refer you to a specialist for more care.

Lowering cholesterol through diet

To help you achieve and maintain healthy cholesterol levels, your doctor may recommend changes to your diet.

For example, they may advise you to:

  • limit your intake of foods that are high in cholesterol, saturated fats, and trans fats
  • choose lean sources of protein, such as chicken, fish, and legumes
  • eat a wide variety of high fiber foods, such as fruits, vegetables, and whole grains
  • opt for baked, broiled, steamed, grilled, and roasted foods instead of fried foods
  • avoid fast food and sugary, pre-packaged options when possible

Foods that are high in cholesterol, saturated fats, or trans fats include:

  • red meat, organ meats, egg yolks, and high fat dairy products
  • processed foods made with cocoa butter or palm oil
  • deep-fried foods, such as potato chips, onion rings, and fried chicken
  • certain baked goods, such as some cookies and muffins

Eating fish and other foods that contain omega-3 fatty acids may also help lower your LDL levels. For example, salmon, mackerel, and herring are rich sources of omega-3s. Walnuts, almonds, ground flaxseeds, and avocados also contain omega-3s.

Cholesterol medications

In some cases, your doctor might prescribe medications to help lower your cholesterol levels.

Statins are the most commonly prescribed medications for high cholesterol. They block your liver from producing more cholesterol.

Examples of statins include:

Your doctor may also prescribe other medications for high cholesterol, such as:

  • niacin
  • bile acid resins or sequestrants, such as colesevalam (Welchol), colestipol (Colestid), or cholestyramine (Prevalite)
  • cholesterol absorption inhibitors, such as ezetimibe (Zetia)
  • PCSK9 inhibitors, such as alirocumab (Praluent) and evolocumab (Repatha)

Some products contain a combination of drugs to help decrease your body’s absorption of cholesterol from foods and reduce your liver’s production of cholesterol. One example is a combination of ezetimibe and simvastatin (Vytorin).

Home remedies to lower cholesterol naturally

In some cases, you may be able to lower your cholesterol levels without taking medications. For example, it may be enough to eat a nutritious diet, exercise regularly, and avoid smoking tobacco products.

Some people also claim that certain herbal and nutritional supplements may help lower cholesterol levels. For instance, claims have been made about:

However, the level of evidence supporting these claims varies. Also, the Food and Drug Administration (FDA) hasn’t approved any of these products for treating high cholesterol. More research is needed to learn if they can help treat this condition.

Always talk with your doctor before taking any herbal or nutritional supplements. In some cases, they might interact with other medications you’re taking.

You can’t control the genetic risk factors for high cholesterol. However, lifestyle factors can be managed.

To lower your risk of developing high cholesterol:

  • Eat a nutritious diet that’s low in cholesterol and animal fats, and high in fiber.
  • Avoid excessive alcohol consumption.
  • Maintain a moderate weight.
  • E.xercise regularly.
  • Avoid smoking.

Follow your doctor’s recommendations for routine cholesterol screening. If you’re at risk of high cholesterol or coronary heart disease, they will likely encourage you to get your cholesterol levels tested on a regular basis.

In most cases, high cholesterol has no symptoms. But without treatment, high cholesterol can cause serious health issues. The good news is that your doctor can help you manage this condition, and in many cases, can help you avoid complications.

To learn if you have high cholesterol, ask your doctor to test your cholesterol levels, especially if you’re 20 years or older. If they diagnose you with high cholesterol, ask them about your treatment options.

To lower your risk of complications from high cholesterol, practice healthy lifestyle habits and follow your doctor’s recommended treatment plan.

Eating a balanced diet, exercising regularly, and avoiding tobacco products may help you achieve and maintain healthy cholesterol levels. It could also help lower your risk of complications from high cholesterol.