What Is Cholesterol?          
Cholesterol is a waxy, fat-like substance that’s found in all cells of the body.
Your body needs some cholesterol to make hormones, vitamin D, and substances that help you digest foods. Your body makes all the cholesterol it needs. However, cholesterol also is found in some of the foods you eat. Cholesterol travels through your bloodstream in small packages called lipoproteins (lip-o-PRO-teens). These packages are made of fat (lipid) on the inside and proteins on the outside.
Cholesterol is oil-based and so does not mix with the blood, which is water-based. It is therefore carried around the body in the blood by lipoproteins.


Types of lipoprotein are:
High-density lipoprotein (HDL) – carries cholesterol away from the cells and back to the liver, where it's either broken down or passed out of the body as a waste product; for this reason, HDL is referred to as "good cholesterol", and higher levels are better
    Low-density lipoprotein (LDL) – carries cholesterol to the cells that need it, but if there's too much cholesterol for the cells to use, it can build up in the artery walls, leading to disease of the arteries; for this reason, LDL is known as "bad cholesterol"
The amount of cholesterol in the blood – both HDL and LDL – can be measured with a blood test.
The recommended cholesterol levels in the blood vary between those with a higher or lower risk of developing arterial disease.
Causes of Cholesterol
High cholesterol can be caused by

It could also be caused by:
Some medical conditions and prescribed medicines can affect your cholesterol levels too.
The following are a common cause of unhealthy blood fats (cholesterol):

Drugs which most commonly raise cholesterol include some diuretics, steroid hormones, immuno-suppressants, beta blockers and antidepressants.  If you are on any of these drugs your doctor will monitor your cholesterol and may have to adjust your treatment to help keep your cholesterol under control.
Other reasons:

Cholesterol levels naturally increase as we get older and following the menopause, women may find their cholesterol levels increase.

Symptoms/Signs of Cholesterol
Though High cholesterol has no symptoms, a blood test is the only way to detect high cholesterol. Yet you could experience this:
Chest pain
If the arteries that supply your heart with blood (coronary arteries) are affected, you may have chest pain (angina) and other symptoms of coronary artery disease.
What should my cholesterol levels be?
Blood cholesterol is measured in units called millimoles per litre of blood, often shortened to mmol/L.
As a general guide, total cholesterol levels should be:
5mmol/L or less for healthy adults
4mmol/L or less for those at high risk
As a general guide, LDL levels should be:
3mmol/L or less for healthy adults
2mmol/L or less for those at high risk

An ideal level of HDL is above 1mmol/L. A lower level of HDL can increase your risk of heart disease.
Your ratio of total cholesterol to HDL may also be calculated. This is your total cholesterol level divided by your HDL level. Generally, this ratio should be below four, as a higher ratio increases your risk of heart disease.
However, cholesterol is only one risk factor and the level at which specific treatment is required will depend on whether other risk factors, such as smoking and high blood pressure, are also present.

How to diagnose Cholesterol
A blood test is the only way to detect high cholesterol.
If you are 20 years old or older, have your cholesterol levels checked at least once every 5 years. Talk with your doctor about how often you should be tested.
How to Prevent Cholesterol


Treatment for Cholesterol

Your doctor may prescribe:

Cholesterol Home Remedies/Home Cure

Complications of Cholesterol
Chest pain: If the arteries that supply your heart with blood (coronary arteries) are affected, you may have chest pain (angina) and other symptoms of coronary artery disease.
Heart attack: If plaques tear or rupture, a blood clot may 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, if blood flow to part of your brain is blocked by a blood clot, a stroke occurs.