Familial hypercholesterolemia is an inherited condition that keeps LDL cholesterol very high from birth, and it often goes unrecognised until someone in the family has a heart attack at a young age. Finding it early changes the outlook for the whole family. This practical guide explains the warning signs, how it is confirmed, and what family testing involves.
Quick answer: Familial hypercholesterolemia (FH) is caused by a gene change that stops the liver clearing LDL properly. It affects roughly 1 in 250 to 1 in 300 people worldwide, which would mean around five million people in India. Clues include very high LDL, early heart disease in close relatives, and cholesterol deposits on tendons. Treatment starts early with cholesterol-lowering medicine, and close relatives, including children, should be tested.
Key takeaways
- ✅ FH is inherited; each child of an affected parent has about a one-in-two chance of having it.
- ✅ Diet helps, but medicine is almost always needed.
- ✅ Testing relatives, called cascade screening, finds people before they have symptoms.
🧬 What is familial hypercholesterolemia?
It is a genetic condition in which LDL receptors on the liver work poorly, so LDL cholesterol builds up in the blood from birth.
Most people with FH inherit one affected gene from one parent, called heterozygous FH. Rarely, a child inherits an affected gene from both parents, causing extremely high cholesterol and heart disease in childhood. Because the high levels are present for decades, arteries are exposed to cholesterol far longer than usual.
🔎 Familial hypercholesterolemia warning signs
The most important clues come from blood tests and family history rather than symptoms.
| Clue | What to look for |
|---|---|
| Very high LDL | LDL around 190 mg/dL or higher in an adult, or high levels in a child |
| Early heart disease in the family | A parent, brother or sister with a heart attack or angina at a young age |
| Tendon xanthomas | Firm lumps on the Achilles tendon or knuckles |
| Corneal arcus at a young age | A white or grey ring at the edge of the iris before about age 45 |
| Poor response to diet | LDL stays very high despite healthy eating |
Doctors often use a scoring system such as the Dutch Lipid Clinic Network criteria, which combines these clues, and genetic testing can confirm the diagnosis where available.
📊 How common is familial hypercholesterolemia in India?
It is more common than most people think, but it is rarely diagnosed.
Worldwide estimates range from about 1 in 250 to 1 in 311 people. An Indian Heart Journal review in 2024 estimated around five million people in India may have FH, and a study in North India found FH in about 15% of patients with premature coronary artery disease. Only a small fraction of people with FH are thought to know they have it.
👪 What does family testing involve?
Once one person is diagnosed, their close relatives are offered testing, starting with the closest family members.
- Test parents, brothers, sisters and children of the person with FH
- If a relative has high LDL, test their close relatives too
- Check children from around early school age, or earlier on a doctor's advice
- Use genetic testing where available to confirm who is affected
This approach, called cascade screening, finds people before they have a heart attack, when treatment works best.
💊 How is familial hypercholesterolemia treated?
Treatment aims to bring LDL down early and keep it down, usually with medicine alongside healthy habits.
Statins are the main treatment, often at higher intensity, and ezetimibe is commonly added. Newer non-statin medicines, such as PCSK9-targeting treatments, are used when LDL stays high. Children with FH may start medicine in childhood on specialist advice. Not smoking, staying active and a healthy diet add further protection. If you are planning a pregnancy, discuss your medicines with your doctor first.
Many families find it helps to understand other parts of the cholesterol picture too: the guide to the inherited Lp(a) cholesterol test covers another inherited risk factor, this cholesterol lowering Indian diet plan suggests everyday meals, and the explainer on high triglycerides covers the other common lipid problem. For the full treatment pathway, see this guide to high cholesterol treatment in Hyderabad.
Living with familial hypercholesterolemia day to day
Once diagnosed and treated, most people with FH lead normal, active lives; the key is steady, long-term care.
- Take cholesterol medicine every day, and keep a list of all medicines and supplements
- Have lipid tests as advised, to check that LDL stays at target
- Keep a family record: who has been tested, their results and their doctors
- Tell new doctors, including dentists and surgeons, that you have FH
- Know the warning signs of a heart attack or stroke, and act on them quickly
It can feel overwhelming to learn that a condition runs in the family. Many families find it helps to share the diagnosis openly, so that brothers, sisters, children and cousins can get tested and treated early, rather than finding out after a heart attack.
Support from a doctor who knows the family history makes long-term care much easier.
❓ Frequently asked questions about familial hypercholesterolemia
Can diet alone control familial hypercholesterolemia?
Rarely. Diet helps, but because the problem is genetic, most people need medicine to reach a safe LDL level.
Should my children be tested if I have FH?
Yes. Each child has about a one-in-two chance of inheriting it, and early treatment protects their arteries.
Is FH the same as high cholesterol from a poor diet?
No. FH is inherited and causes high LDL from birth, regardless of diet or weight.
Can someone slim and active have FH?
Yes. FH occurs at any weight or fitness level, which is why it can be missed.
Sources
- Familial hypercholesterolemia in India. Indian Heart Journal 2024
- CDC: How common is familial hypercholesterolemia?
- Familial hypercholesterolemia: review article (PubMed Central)
Last updated: October 2026. General health information only, not a diagnosis. If high cholesterol or early heart disease runs in your family, ask your doctor about testing.
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