This fat can plug up your arteries and keep the blood from flowing through them. If an artery going to your heart gets blocked, you might have a heart attack. If an artery going to your brain gets blocked, you might have a stroke. A high LDL level causes heart disease, stroke, poor circulation and kidney disease. Most people have high levels of fat in their blood because they eat too much high-fat food.
Some people have high fat levels because they have an inherited disorder.
High lipid levels may also be caused by medical conditions such as diabetes, hypothyroidism, alcoholism, kidney disease, liver disease and stress. In some people, certain medicines, such as birth control pills, steroids and blood pressure medicines, can cause high lipid levels. If you're over 20 years of age, you should have a blood test to measure your cholesterol. If your cholesterol level is high, your doctor will recommend treatment and will recheck your cholesterol every so often. Often there are no signs.