Isla Bennett
Bulging nails, also known as clubbed nails, are nails that thicken and curve around the fingertips. They can be a sign of severe disease, such as lung cancer, heart defects, or digestive conditions including cystic fibrosis or celiac disease. However, they are not always cause for alarm, especially if nail clubbing runs in your family. In this article, we will explore the causes and symptoms of bulging nails, as well as treatment options.
| Characteristics | Values |
|---|---|
| Shape | Curved downward, like a spoon |
| Texture | Soft |
| Relationship to cuticle | No longer sit even with the cuticle |
| Speed of development | Can develop quickly, often within weeks |
| Speed of disappearance | Can go away quickly when its cause is treated |
| Common causes | Lung cancer, heart defects, digestive conditions, chronic smoking, hyperthyroidism, celiac disease, cirrhosis, Crohn's disease |
| Underlying cause | Low levels of oxygen in the blood |
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What You'll Learn
Clubbing of the fingers or toes
Clubbing is often a symptom of low oxygen in the blood, known as hypoxemia, which can be caused by chronic smoking, or conditions such as lung cancer, heart defects, or digestive conditions including cystic fibrosis or celiac disease. It can also be caused by an aortic aneurysm, a balloon-like bulge in the aorta, the large artery that carries blood from the heart through the chest and torso.
There are two types of clubbed fingers, nails, or toes. Primary (idiopathic) clubbing, also called hypertrophic osteoarthropathy (HOA), is hereditary and passed down via genes. It is simply a physical feature, like eye colour and height, and is not always cause for alarm. Several genes have been associated with primary clubbing, including the HPGD gene and the SLCO2A1 gene. Hereditary clubbing accounts for just 3% of all clubbing cases.
Secondary nail clubbing can be caused by conditions unrelated to the heart or lungs, such as endocrine problems (e.g. hyperthyroidism, especially Graves' disease), celiac disease, cirrhosis, or Crohn's disease.
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Hereditary clubbing
Clubbed fingers describe fingernails or toenails that are curved downward, like a spoon. The nails may feel soft when pressed and no longer sit even with the cuticle. This often occurs along with swelling or bulging of the tips of the fingers or toes.
There are two types of clubbed fingers, nails, or toes. Primary (idiopathic) clubbing, also called hypertrophic osteoarthropathy (HOA), is hereditary and is passed down via genes. Hereditary clubbing is simply a physical feature, like eye colour and height. Several genes have been associated with primary clubbing, including the HPGD gene and the SLCO2A1 gene. Clubbing occurs alone, without an underlying health condition, and is a rare inherited trait—accounting for just 3% of all clubbing cases. If you or your child has primary HOA, then your fingers or toes may naturally appear large, bulging, and rounded.
Clubbing usually happens because of long-term low levels of oxygen in the blood, known as hypoxemia. However, clubbed nails are not always cause for alarm, especially if nail clubbing runs in your family. Lung cancer is the most common cause of clubbing. Clubbing often occurs in heart and lung diseases that reduce the amount of oxygen in the blood. These may include heart defects that are present at birth (congenital), chronic lung infections that occur in people with bronchiectasis, cystic fibrosis, or lung abscess, and infection of the lining of the heart chambers and heart valves (infectious endocarditis).
Secondary nail clubbing can have causes that are unrelated to the heart or lungs, such as endocrine problems (e.g. hyperthyroidism, especially Graves' disease), celiac disease, cirrhosis, and Crohn's disease.
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Low oxygen in the blood
Bulging nails are a sign of a condition known as clubbed fingers or toes. This is when the nails thicken and curve around the fingertips, forming a sharper angle with the cuticle. The last part of the finger may appear large or bulging, and the nail curves downward, like the round part of an upside-down spoon. Clubbing can develop quickly, often within weeks, and it can also go away quickly when its underlying cause is treated.
Clubbing is often associated with low oxygen in the blood, also known as hypoxemia. This can be caused by a variety of conditions, including:
- Lung cancer
- Heart defects
- Digestive conditions such as cystic fibrosis or celiac disease
- Chronic lung infections such as bronchiectasis or lung abscess
- Infection of the lining of the heart chambers and heart valves (infectious endocarditis)
- Chronic smoking, which blocks oxygen from getting to the tissues, including the fingernails
However, it's important to note that clubbed nails are not always cause for alarm, especially if nail clubbing runs in your family. Primary (idiopathic) clubbing, also called hypertrophic osteoarthropathy (HOA), is hereditary and passed down through genes. It is simply a physical feature, like eye colour or height, and is not indicative of an underlying health condition.
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Heart and lung diseases
Clubbed fingers or toes, also known as clubbing, is when nails thicken and curve around the fingertips or toes, forming a sharper angle with the cuticle. The last part of the finger or toe may appear large or bulging, and it may also be warm and red. This can be a symptom of heart and lung diseases that reduce the amount of oxygen in the blood, such as:
- Heart defects that are present at birth (congenital)
- Chronic lung infections that occur in people with bronchiectasis, cystic fibrosis, or lung abscess
- Infection of the lining of the heart chambers and heart valves (infectious endocarditis)
- Lung cancer
Clubbing can develop quickly, often within weeks, and it can also go away quickly when its cause is treated. It is often the result of long-term low levels of oxygen in the blood, known as hypoxemia. This can be caused by chronic smoking, which blocks oxygen from getting to tissues, including fingernails. Over time, this can lead to the growth of bone-forming and connective tissue-forming cells in the nails. However, clubbed nails are not always cause for alarm, especially if nail clubbing runs in your family. Hereditary clubbing is simply a physical feature, like eye colour and height, and is a rare inherited trait, accounting for just 3% of all clubbing cases.
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Endocrine problems
Clubbed fingers and toes are characterised by nails that curve downward, like a spoon. The nails may feel soft when pressed and no longer sit even with the cuticle. This often occurs alongside swelling or bulging of the tips of the fingers or toes.
Clubbing can be a symptom of endocrine problems, such as hyperthyroidism, especially Graves' disease. Endocrine problems occur when the body's hormone levels are imbalanced. The endocrine system is made up of glands that produce and secrete hormones, which are chemical messengers that regulate bodily functions. When the endocrine system is not functioning properly, it can lead to a variety of health issues, including clubbed fingers and toes.
Hyperthyroidism is a condition in which the thyroid gland produces an excess of thyroid hormones. This can cause a variety of symptoms, including weight loss, increased heart rate, and anxiety. Graves' disease is an autoimmune disorder that affects the thyroid gland and is the most common cause of hyperthyroidism. It is characterised by the production of antibodies that stimulate the thyroid gland to produce too much hormone. In addition to clubbed fingers and toes, Graves' disease can cause a goitre, which is an enlargement of the thyroid gland, as well as eye problems and skin changes.
While clubbed fingers and toes can be a sign of endocrine problems, it is important to note that they can also be caused by other conditions, such as lung cancer, heart defects, or digestive conditions. Clubbing usually occurs due to long-term low levels of oxygen in the blood, known as hypoxemia. However, clubbed nails are not always cause for alarm, especially if nail clubbing runs in your family. Hereditary clubbing, also known as primary (idiopathic) clubbing or hypertrophic osteoarthropathy (HOA), is simply a physical feature passed down through genes and is not associated with any underlying health conditions.
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Frequently asked questions
It could be a condition called clubbing, where nails thicken and curve around the fingertips, forming a sharper angle with the cuticle.
The nails curve downward, like a spoon. The tips of the fingers or toes may also appear large or bulging, and they may be warm and red.
Clubbing is often caused by low oxygen in the blood, which can be the result of lung cancer, heart defects, or digestive conditions such as cystic fibrosis or celiac disease. It can also be caused by chronic smoking.
No, not always. Clubbing can be hereditary and is simply a physical feature in some people. However, it is still important to get checked out by a doctor to rule out any underlying health conditions.
