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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Cardiology

Symptoms and Warning Signs of FH

At a Glance

Familial hypercholesterolemia often causes no visible symptoms, especially in children, so looking healthy does not rule it out. A cholesterol blood test and family history help identify it, while severe chest pain, breathing trouble, fainting, or stroke signs require emergency care.

Familial Hypercholesterolemia (FH) is often called a “silent” condition because most people—especially children with the heterozygous (HeFH) form—feel completely healthy and have no outward signs of high cholesterol [1][2]. However, because the body cannot clear cholesterol properly from birth, the excess can eventually build up in visible places like the skin and tendons, or invisible places like the arteries [3][4].

Physical Signs of Cholesterol Buildup

In some cases, your doctor may look for specific physical clues that suggest FH. These are much more common in children with the rare homozygous (HoFH) form, where signs can appear in infancy [5]. In children with HeFH, these signs are rare and typically do not appear until adulthood [6].

  • Tendon Xanthomas: These are firm, painless bumps or general thickening caused by cholesterol deposits in the tendons [7]. They most often affect the Achilles tendon (the large cord above the heel) or the tendons on the back of the hands [8].
  • Cutaneous Xanthomas: These are yellowish-orange patches or bumps on the skin [9]. They often appear on the knees, elbows, or buttocks and are a classic early sign of HoFH [5][10].
  • Corneal Arcus: This is a white, gray, or blue ring located in the cornea around the colored part of the eye (the iris) [11]. While common in the elderly, seeing this ring in someone under age 45 may prompt an evaluation for FH [12].
  • Xanthelasma: These are flat, yellowish growths on or around the eyelids [11].

It is vital to remember that these findings should prompt clinical evaluation but are not diagnostic of FH by themselves and can occur with other conditions. Furthermore, the absence of these signs does not mean you do not have FH. In one study of adults with HeFH, only about 14.5% had any of these visible signs [12]. Most children with HeFH will have perfectly normal physical exams despite having very high internal cholesterol levels [2]. Please do not rely on visible signs for self-diagnosis; accurate diagnosis requires lipid testing and a review of family history.

Red Flags: When to Seek Emergency Care

While high cholesterol itself is not an emergency, the complications it causes can be [13]. Over time, in severe cases—particularly in children with HoFH or severe, untreated HeFH—atherosclerosis and valve disease can progress and narrow the arteries or the heart’s aortic valve (the main door that lets blood out of the heart) [14][15].

If you or your child experiences any of the following severe “red flag” symptoms, stop exertion immediately and call your local emergency number (e.g., 911), regardless of whether you have HeFH or HoFH:

  • Severe or Persistent Chest Pain: This may feel like a heavy weight, squeezing, or “tightness” in the chest [16]. In children, this may happen during exercise or even while resting [13].
  • Severe Shortness of Breath: Difficulty breathing that is out of proportion to the activity being done, or trouble breathing while lying flat [16][17].
  • Fainting or Collapse: Any sudden loss of consciousness (syncope) or collapsing during physical activity [13][18].
  • Signs of Stroke: Sudden numbness, weakness, or difficulty speaking.

Other symptoms, such as extreme fatigue or isolated heart palpitations (a feeling that the heart is racing or fluttering), are nonspecific and do not uniformly require an ambulance, but they do require you to seek prompt medical advice from your care team [17][13]. Keep in mind that symptoms can be caused by FH complications or by unrelated conditions.

Screening Is Essential

Because physical symptoms are so rare in childhood, you cannot rely on “looking healthy” to gauge risk [2]. This is why medical guidelines emphasize screening for children and cascade testing (testing all close family members) once FH is identified in one person [19][20]. Early detection allows for management that can significantly lower the risk of these “red flag” symptoms from ever occurring [21].

Common questions in this guide

What physical signs can familial hypercholesterolemia cause?
Possible signs include firm thickened areas or bumps on the Achilles or hand tendons, yellowish patches or bumps on the skin, a ring around the cornea, and yellow growths around the eyelids. These findings are more common in homozygous FH and are not diagnostic by themselves.
Can a child have FH without looking or feeling sick?
Yes. Most children with heterozygous FH feel healthy and have no visible signs, even when cholesterol levels are very high. The absence of physical findings does not rule out FH, so diagnosis depends on cholesterol testing and family history.
When is familial hypercholesterolemia an emergency?
Call your local emergency number for severe or persistent chest pain, severe trouble breathing, fainting or collapse, or sudden numbness, weakness, or difficulty speaking. Stop exertion immediately, especially if symptoms occur during exercise.
What should I do if my child has chest pain while playing sports?
Have your child stop exercising immediately and assess the symptoms. Severe or persistent chest pain, chest pain with breathing trouble, or chest pain followed by fainting requires emergency care; contact the care team promptly even if the pain improves.
How is FH diagnosed when there are no physical signs?
FH is identified with a cholesterol blood test and a review of personal and family history. Once one person is diagnosed, cascade testing of close family members can help find others who may have the condition.
Are fatigue or heart palpitations always an FH emergency?
Extreme fatigue and isolated heart palpitations are nonspecific and do not always require an ambulance. They should still be reported promptly to the healthcare team, especially if they are new, severe, or occur with chest pain, breathing trouble, or fainting.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does my child have any physical signs of FH that I might have missed, like thickening of the Achilles tendons?
  2. 2.Since my child has no physical symptoms, how do we know the treatment is working effectively?
  3. 3.In our specific case, what would a 'heart emergency' look like, and which hospital should we go to if it happens?
  4. 4.If my child experiences chest pain during sports, should we stop immediately and call you, or go to the ER?
  5. 5.Does the lack of physical signs mean my child's case is 'mild,' or is the internal risk still the same?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (21)
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    The genetics of familial hypercholesterolemia and emerging therapies.

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    The application of clinical genetics 2015; (8()):27-36 doi:10.2147/TACG.S44315.

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    Diagnosis of Familial Hypercholesterolemia in Children and Young Adults.

    Timoshchenko O, Ivanoshchuk D, Semaev S, et al.

    International journal of molecular sciences 2023; (25(1)) doi:10.3390/ijms25010314.

    PMID: 38203485
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    Molecular basis of familial hypercholesterolemia.

    Bruikman CS, Hovingh GK, Kastelein JJP

    Current opinion in cardiology 2017; (32(3)):262-266 doi:10.1097/HCO.0000000000000385.

    PMID: 28169949
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    Guidelines for Diagnosis and Treatment of Familial Hypercholesterolemia 2017.

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    Journal of atherosclerosis and thrombosis 2018; (25(8)):751-770 doi:10.5551/jat.CR003.

    PMID: 29877295
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    Guidance for Pediatric Familial Hypercholesterolemia 2017.

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    Journal of atherosclerosis and thrombosis 2018; (25(6)):539-553 doi:10.5551/jat.CR002.

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    Genetic Testing for Children with Familial Hypercholesterolemia.

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    Journal of atherosclerosis and thrombosis 2026; (33(3)):237-248 doi:10.5551/jat.RV22046.

    PMID: 41407356
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    Impact of Achilles tendon on diagnosis and phenotypes of familial hypercholesterolemia.

    Tada H, Nohara A, Kawashiri MA, Takamura M

    Current opinion in lipidology 2025; (36(4)):163-169 doi:10.1097/MOL.0000000000000992.

    PMID: 40277332
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    Homozygous Familial Hypercholesterolemia in a Seven-Year-Old: A Case Study Highlighting the Importance of Early Diagnosis.

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    Surgical Treatment of Multiple Large Tuberous and Tendinous Xanthoma Secondary to Familial Hypercholesterolaemia: A Case Report.

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    Case Report: Liver Transplantation in Homozygous Familial Hypercholesterolemia (HoFH)-Long-Term Follow-Up of a Patient and Literature Review.

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    The value of physical signs in identifying patients with familial hypercholesterolemia in the era of genetic testing.

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    Physical signs and atherosclerotic cardiovascular disease in familial hypercholesterolemia: the HELLAS-FH Registry.

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    Journal of cardiovascular medicine (Hagerstown, Md.) 2024; (25(5)):370-378 doi:10.2459/JCM.0000000000001612.

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    A case report of an acute coronary syndrome in a 10-year-old boy with homozygous familial hypercholesterolaemia.

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    Intravascular Ultrasound-Guided Stenting of the Left Main Coronary Artery in a Pediatric Patient with Homozygous Familial Hypercholesterolemia.

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    Cardiogenic shock following acute MI in a young patient with familial hypercholesterolemia, and severe aortic stenosis: A case report.

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    The High Price of Interrupted Follow-Up: Catastrophic Progression of Homozygous Familial Hypercholesterolemia-A Case Report and Literature Review.

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This page is for informational purposes only and does not constitute medical advice. Visible signs are not diagnostic; ask your healthcare team about testing, and call emergency services for severe chest pain, severe breathing trouble, fainting, or stroke signs.

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