High cholesterol has no symptoms. A blood test is the only way to detect if you have it.

High cholesterol can cause a dangerous accumulation of cholesterol and other deposits on the walls of your arteries (atherosclerosis). These deposits (plaques) can reduce blood flow through your arteries, which can cause complications, such as:

• Chest pain. If the arteries that supply your heart with blood (coronary arteries) are affected, you might have chest pain (angina) and other symptoms of coronary artery disease.
• Heart attack. If plaques tear or rupture, a blood clot can form at the plaque-rupture site — blocking the flow of blood or breaking free and plugging an artery downstream. If blood flow to part of your heart stops, you’ll have a heart attack.
• Stroke. Similar to a heart attack, a stroke occurs when a blood clot blocks blood flow to part of your brain.

Prevention

The same heart-healthy lifestyle changes that can lower your cholesterol can help prevent you from having high cholesterol in the first place. To help prevent high cholesterol, you can:

• Eat a low-salt diet that emphasizes fruits, vegetables, and whole grains
• Limit the number of animal fats and use good fats in moderation
• Lose extra pounds and maintain a healthy weight
• Quit smoking
• Exercise on most days of the week for at least 30 minutes
• Drink alcohol in moderation, if at all
• Manage stress