Liam Carter
Clubbing of the fingers and toes is a condition where the nails become wider and rounder, resembling an upside-down spoon. It is often associated with underlying diseases, particularly those affecting the heart and lungs, such as lung cancer, cystic fibrosis, and cardiovascular disease. While the exact cause of sporadic clubbing is unknown, it is generally considered a symptom rather than a disease itself. In most cases, it is triggered by a number of conditions, and it has been recognized as a sign of disease since Hippocrates. Given that clubbing is usually indicative of an underlying health issue, it is important to consult a healthcare provider for a proper diagnosis and treatment plan.
| Characteristics | Values |
|---|---|
| Definition | Digital clubbing, or changes in the nails on your fingers and toes |
| Cause | Mostly a symptom of another disease, but can be idiopathic (no cause) or congenital (something you're born with) |
| Appearance | Nails curve downward and look like an upside-down spoon; the nail beds soften and the nails seem to "float" instead of being firmly attached; the last part of the finger may appear large or bulging and may be warm and red |
| Diagnosis | Schamroth's sign or Schamroth's window test; measurement of the Lovibond angle or the Lovibond profile sign |
| Treatment | There is no treatment for nail clubbing itself, but the underlying cause can be treated |
| Prevention | There is no known way to prevent nail clubbing, but some of the conditions that lead to it can be prevented |
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What You'll Learn
What is nail clubbing?
Nail clubbing is a physical change in the appearance and structure of your fingernails or toenails, which can occur as a symptom of an underlying health condition. It is a soft tissue swelling of the terminal phalanx, resulting in the straightening of the angle between the nail bed and the nail. This is known as the Lovibond angle sign, and in the early stages of nail clubbing, it is flattened or lost. The nail cuticle angle straightening is the most sensitive measurement of these features.
The clubbing of nails is often associated with diseases of the heart and lungs, such as lung cancer, lung infections, interstitial lung disease, cystic fibrosis, cardiovascular disease, and congenital cyanotic heart disease. It can also be caused by digestive conditions such as Crohn's disease, celiac disease, and other conditions that cause inflammation in the digestive system. Liver disease, thyroid conditions, and other cancers such as oesophageal cancer, Hodgkin lymphoma, and rhabdomyosarcoma can also lead to nail clubbing.
Nail clubbing is usually painless and harmless, but it often indicates an underlying health condition that requires medical attention. The treatment for nail clubbing, therefore, involves addressing the underlying cause, which may include chemotherapy, surgery, radiation therapy, or medication. In some cases, nail clubbing may occur without an obvious reason, and it can be congenital or hereditary.
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What are the symptoms of nail clubbing?
Nail clubbing refers to changes in the appearance and structure of your fingernails or toenails. It is often a symptom of an underlying health condition, particularly those affecting the heart, lungs, or digestive system. Nail clubbing can be congenital (something you're born with) or hereditary, and it can also occur without an obvious cause.
The symptoms of nail clubbing include:
- Nails that feel soft and spongy, and may be warm to the touch.
- Nails that curve downward and widen, forming a rounded, bulging shape that resembles an upside-down spoon.
- The root of the nail may appear to be separated from the bone, giving the nail a ""floating" appearance.
- The nail bed and nail may look flat when viewed from the side, resulting in the loss of the Lovibond angle (a slight dent at the base of the nail).
- The angle between the nail and the cuticle may straighten and widen.
- The tips of the fingers or toes may enlarge and become discolored, warm, or red.
If you notice any of these symptoms, it is important to consult a healthcare provider as nail clubbing may indicate a serious underlying health condition that requires treatment.
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What causes nail clubbing?
Nail clubbing, also known as digital clubbing, is a change in the appearance and structure of your fingernails or toenails. It is mostly a symptom rather than a disease itself. The tips of your fingers or toes may bulge and become warm, reddened, or discoloured. The nail curves down so that it eventually looks like an upside-down spoon. The nail beds soften, and the nails seem loosely attached, as if floating. Nail clubbing can affect a few or all of your nails, and it often starts in your thumb and forefinger before spreading to other nails.
Nail clubbing is often triggered by an underlying health condition, particularly those affecting your heart, lungs, or gastrointestinal system. It is associated with low oxygen levels in the blood. Diseases that cause nail clubbing include:
- Lung cancer
- Other types of lung disease, such as pulmonary fibrosis or asbestosis
- Cardiovascular disease
- Congenital heart disease
- Cystic fibrosis
- Crohn's disease
- Celiac disease
- Hyperthyroidism
- Cirrhosis of the liver
- Esophageal cancer
- Gastrointestinal tumours
- Liver cancer
- Mesothelioma
- Aortic aneurysm
- Bronchiectasis
- Empyema
- Cardiac tumours
- Inflammatory bowel disease
Nail clubbing can also be congenital (something you’re born with) or hereditary. In some cases, it occurs in a healthy person with no obvious reason.
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How is nail clubbing diagnosed?
Nail clubbing is mostly a symptom of an underlying disease rather than a disease itself. It is characterised by changes in the appearance and structure of the nails, which may feel soft, spongy, and warm to the touch. The nail bed softens, and the nails may seem to float instead of being firmly attached. The nail curves downward, forming a rounded, bulging shape that resembles an upside-down spoon.
If you notice any of these signs, it is important to see a healthcare provider for a proper diagnosis. The diagnosis of nail clubbing typically involves taking a medical history and conducting a physical examination. During the physical exam, your healthcare provider may use the following methods to assess for clubbing:
- Lovibond angle sign: When viewed from the side, a non-clubbed nail should have a slight dent at the base, with an angle of less than 180 degrees. In the early stages of nail clubbing, this dent may be absent, and the angle can be greater than 180 degrees.
- Schamroth sign: This sign is observed when you press one finger against the same finger on the other hand at the joint, so that the nails are facing each other. In fingers without clubbing, a diamond-shaped space is formed between the nails, while in clubbed fingers, this space is obliterated.
- Phalangeal depth ratio: This is the ratio of the depth of the digit measured at the nail and the distal interphalangeal joint. In non-clubbed nails, the depth at the distal interphalangeal joint is normally greater than the depth at the nail, resulting in a ratio of less than 1. A ratio of greater than 1 supports the presence of clubbing.
Based on the findings from the physical examination and medical history, your healthcare provider may refer you to specialists for further evaluation, depending on the suspected underlying cause. These specialists may include pulmonologists, oncologists, infectious disease specialists, cardiologists, gastroenterologists, endocrinologists, or radiologists.
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Can nail clubbing be treated?
Nail clubbing is mostly a symptom of an underlying disease rather than a disease itself. It is characterised by a change in the appearance and structure of the nails, which may feel soft and sponge-like, warm to the touch, and form a rounded, bulging shape, giving the appearance of an upside-down spoon. It is often associated with diseases of the heart, lungs, and digestive system, and can be a sign of a serious health condition.
There is no treatment for nail clubbing itself, but the underlying cause can be treated. Treatment options depend on the underlying cause and may include chemotherapy, surgery, radiation therapy, or medications. For example, lung cancer may be treated with chemotherapy, radiation therapy, or surgery; celiac disease may be treated with a gluten-free diet; and hyperthyroidism may be treated with medications or surgery. After treating the underlying cause, nails may gradually return to normal, although nail clubbing is not always reversible.
The initial evaluation of nail clubbing involves taking a detailed medical history and conducting a thorough clinical examination, including a physical exam. Attention is paid to lung, heart, and gastrointestinal conditions, and additional studies such as a chest X-ray and a chest CT-scan may be performed to look for cardiopulmonary disease. The Lovibond angle or the Lovibond profile sign may also be measured, which involves looking at the angle between the proximal nail fold (the part near the cuticle) and the nail bed from the side. If the angle is greater than 180 degrees, it indicates clubbing. Schamroth's sign or Schamroth's window test is another popular test for clubbing, which involves placing the fingernails of the same finger on opposite hands against each other, nail to nail. If there is no space between the nails and only nail beds are visible, the test is positive for clubbing.
In some cases, nail clubbing may be idiopathic, meaning there is no known cause, or it may be congenital or hereditary. While nail clubbing itself is not harmful or painful, it is important to see a healthcare provider for an evaluation to rule out any serious underlying conditions.
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Frequently asked questions
Nail clubbing is a physical change in the appearance and structure of your fingernails or toenails, often resulting from an underlying health condition. The tips of the nails curve downward and the nail beds soften, giving the nails a rounded, bulging shape that resembles an upside-down spoon.
Nail clubbing is associated with various diseases, particularly those affecting the heart, lungs, and digestive system. These include lung cancer, lung infections, cystic fibrosis, cardiovascular disease, liver disease, Crohn's disease, and hyperthyroidism. In some cases, nail clubbing may be congenital or hereditary, with no apparent underlying cause.
A sliced finger injury is not a known direct cause of nail clubbing. Nail clubbing is typically associated with underlying health conditions, particularly affecting the heart, lungs, and digestive system. However, it is always advisable to monitor any changes in your nails and consult a healthcare professional if you have concerns.
