Blocked blood vessels raises the risk of heart attacks and strokes, as it limits the blood supply to the heart and the rest of the body.
It's not always easy to know whether you have high cholesterol, as there aren't any obvious symptoms.
But, there are some hidden warning signs that you should consider getting your cholesterol levels checked.
You could, however, be at risk of high cholesterol if you develop yellow fatty growths on your skin.
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"A high level of cholesterol in the blood doesn't have obvious symptoms," said medical website WebMD.
"But, it can increase your risk for conditions that do have symptoms, including angina [chest pain caused by heart disease], high blood pressure, stroke, and other circulatory ailments.
"Soft, yellowish growths or lesions on the skin called xanthomas may indicate a genetic predisposition to cholesterol problems.
"Call your doctor about heart disease if you detect soft, yellowish skin growths on yourself or on your children. Ask about being tested for high cholesterol."
Your doctor or dermatologist should be able to diagnose xanthomas from a quick examination.
A skin biopsy may confirm their diagnosis, which is where a sample of your skin is sent to a laboratory for examination.
Treating the underlying cause of the xanthoma is the best way to get rid of the fatty lumps.
But, they can also be removed via surgery or chemical treatment. They may return, however, so treating the underlying cause is the best option.
Meanwhile, high cholesterol may be caused by eating lots of fatty foods, or by not doing enough exercise.
Obesity, smoking, and drinking lots of alcohol, all contribute to your cholesterol levels.
Medication can help to keep your cholesterol levels in check, but it's also important to stick to a healthy diet, and to do regular exercise.
Everyone should aim to eat at least five portions of fruit and vegetables every day, as well as 150 minutes of exercise every week.
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High cholesterol warning: The fatty growths on your skin that raise your heart attack risk - Express
