Does high low-density lipoprotein (LDL) cholesterol cause clear symptoms, and how can I detect its levels?

The most important scientific fact regarding low-density lipoprotein (LDL) cholesterol is that it does not cause noticeable physical symptoms in most cases, particularly in its early stages. High LDL levels are considered a "silent killer" because lipids accumulate slowly within the walls of the arteries without the patient feeling any discomfort or warning signs [1]. This means you cannot rely on how you physically feel to determine whether your cholesterol levels are high or within the normal range.

Why does high LDL not cause early symptoms?

The danger lies in the nature of how LDL cholesterol affects the body. LDL works to build a substance known as plaque inside the body's arteries in a gradual process called atherosclerosis [1]. This process does not lead to any pain or change in daily bodily functions until the arteries become significantly narrowed or blocked, preventing sufficient blood flow to the heart or other body organs [1]. Therefore, the absence of symptoms does not mean the absence of risk.

How can LDL cholesterol levels be detected?

The only reliable method to determine the level of LDL cholesterol in your blood is by performing a laboratory blood test [1]. This test is a routine part of health screenings requested by physicians. In rare or specific cases, doctors may suggest additional tests such as an apolipoprotein (ApoB100) test to help identify specific causes of high cholesterol or to assess risks more accurately, but the standard test remains the foundation [2].

Recommended Screening Schedule

Screening recommendations vary based on age, risk factors, and family history. Generally, recommendations include the following:

• For children and adolescents: The first screening should be conducted between the ages of 9 and 11, then repeated every 5 years. Screening may begin at an earlier age (age 2) if there is a family history of high cholesterol or heart disease [1].
• For adults (20 years and older): Cholesterol levels should be checked at least every 5 years.
• For men and women in their forties and fifties: It is recommended to increase the frequency of screening to every 1 to 2 years, while an annual frequency is recommended for those over 65 [1].

Individuals with chronic conditions such as diabetes or heart disease may need more frequent screenings based on the guidance of their treating physician.

When do warning signs appear?

If high LDL cholesterol is left untreated for long periods, symptoms of complications may begin to appear, rather than symptoms of the cholesterol itself. These signs include feeling chest pain (angina) due to a lack of oxygen reaching the heart, or the first sign may be an acute heart attack if an artery becomes completely blocked [1]. If you feel any sudden chest pain, shortness of breath, or pain extending to the jaw and arms, you must seek emergency medical care immediately, as these symptoms indicate a serious heart problem that requires urgent intervention. To learn more about how to manage these levels before complications arise, see our article on LDL Cholesterol: When does it become dangerous and how can you lower it with a healthy lifestyle and medication? (Arabic).

Medical references

• LDL: The "Bad" Cholesterol
• Apolipoprotein B100