Endocarditis is a condition that can cause a range of symptoms, including fever, chills, and nausea. As the condition progresses, it can also lead to changes in the appearance of the fingernails, such as the development of thin, vertical red or reddish-brown lines known as splinter hemorrhages. These lines are a result of damage to the small blood vessels (capillaries) under the nails and can be a sign of endocarditis, particularly when accompanied by other symptoms such as a heart murmur and unexplained fever. While splinter hemorrhages can also be caused by trauma to the fingertip or other health issues, it is important to seek medical advice if you notice any changes in your nails, as they may indicate a more serious underlying condition.
| Characteristics | Values |
|---|---|
| Appearance | Thin, vertical red or reddish-brown lines under the fingernail |
| Name | Splinter haemorrhages |
| Cause | Damaged or swollen blood vessels, small clots, or trauma to the fingertip |
| Other symptoms | Flu-like symptoms, including fever, chills, and nausea |
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What You'll Learn
- Splinter hemorrhages are thin red or reddish-brown lines that appear under the nail and run in the direction of nail growth
- Endocarditis is a possible cause of splinter hemorrhages, but they can also be caused by trauma to the fingertip or other health issues
- Splinter hemorrhages are a result of damaged blood vessels or small clots injuring the capillaries under the nails
- Other nail abnormalities that can indicate systemic disease include clubbing of the nails, koilonychia, and onycholysis
- If you notice colour changes under your nails that are not due to nail trauma, it may be a symptom of a more serious condition such as endocarditis or melanoma

Splinter hemorrhages are thin red or reddish-brown lines that appear under the nail and run in the direction of nail growth
Endocarditis is a condition that can affect other parts of the body as it progresses. Early symptoms typically involve flu-like symptoms, including fever, chills, and nausea. As the condition advances, it can cause changes in the nails, such as splinter hemorrhages. These changes may be a sign that the small blood vessels (capillaries) under the nails are damaged.
It is important to note that nail abnormalities can be indicative of various systemic diseases. For example, clubbing of the nails often suggests pulmonary disease or inflammatory bowel disease, while koilonychia, or "spoon-shaped" nails, may indicate hemochromatosis or anemia. Therefore, if you notice any unusual changes in your nails, it is recommended to consult a doctor for a proper evaluation.
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Endocarditis is a possible cause of splinter hemorrhages, but they can also be caused by trauma to the fingertip or other health issues
Endocarditis is a possible cause of splinter hemorrhages, which are thin red or reddish-brown lines that appear under the fingertips and run in the direction that the nail grows. These lines are a sign that either blood vessels have become swollen and damaged or small clots have injured the capillaries under the nails. Splinter haemorrhages can also be caused by trauma to the fingertip or other health issues, such as psoriasis, a fungal infection, or melanoma.
While endocarditis is a possible cause of splinter haemorrhages, it is important to note that there are other potential causes as well. Early symptoms of endocarditis typically involve flu-like symptoms, including fever, chills, and nausea. As the condition progresses, it can affect other parts of the body, including the nails. If you notice any changes in your nails, such as dark brown, black, or red colour changes, it is important to see a doctor, especially if there has been no trauma to the nail.
In addition to endocarditis, splinter haemorrhages can also be caused by trauma to the fingertip. This can include injuries to the nail, such as hitting your finger with a hammer or closing your finger in a door. It is important to note that splinter haemorrhages can also be a sign of other health issues, such as psoriasis, a fungal infection, or melanoma. Therefore, if you notice any changes in your nails, it is important to consult a doctor to determine the underlying cause.
While splinter haemorrhages can be a sign of endocarditis, it is important to consider other potential causes as well. If you are experiencing flu-like symptoms, such as fever, chills, or nausea, it is important to seek medical attention as these could be early signs of endocarditis. Additionally, if you have a heart murmur or unexplained fever, splinter haemorrhages can be a warning sign of endocarditis. Therefore, it is crucial to be evaluated by a doctor to determine the underlying cause of any nail abnormalities.
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Splinter hemorrhages are a result of damaged blood vessels or small clots injuring the capillaries under the nails
While splinter hemorrhages can occur because of trauma to the fingertip and other health issues, they are a classic finding in patients with endocarditis. Endocarditis can cause the small blood vessels (capillaries) to become swollen and damaged, leading to splinter hemorrhages.
It is important to note that nail changes, including colour changes such as dark brown, black, or red, can be a symptom of a more serious condition like endocarditis or melanoma. Therefore, if you notice any unusual nail changes, it is recommended to consult a doctor for evaluation.
In addition to nail abnormalities, early symptoms of endocarditis typically include flu-like symptoms such as fever, chills, and nausea. As the condition progresses, it can affect other parts of the body. Splinter hemorrhages in patients with heart murmur and unexplained fever can be indicative of endocarditis.
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Other nail abnormalities that can indicate systemic disease include clubbing of the nails, koilonychia, and onycholysis
Vertical red lines on the thumb nail, known as splinter hemorrhages, can be a symptom of endocarditis. Endocarditis is a condition that can affect other parts of the body, and can cause damage to small blood vessels (capillaries).
Other nail abnormalities can also indicate systemic disease. Clubbing of the nails often suggests pulmonary disease or inflammatory bowel disease. Koilonychia, or 'spoon-shaped' nails, may indicate hemochromatosis or anaemia. Onycholysis, in the absence of trauma or psoriasis, can be a sign of hyperthyroidism. Beau's lines may indicate previous severe illness, trauma, or exposure to cold temperatures in patients with Raynaud's disease. Muehrcke's lines indicate low albumin levels. Telangiectasia, koilonychia, or pitting of the nails may be a sign of connective tissue disorders.
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If you notice colour changes under your nails that are not due to nail trauma, it may be a symptom of a more serious condition such as endocarditis or melanoma
While endocarditis can cause colour changes under the nails, it typically presents with early flu-like symptoms, including fever, chills, and nausea. As the condition progresses, it can affect other parts of the body, including the nails. Other nail abnormalities that can indicate a serious condition include clubbing of the nails, which suggests pulmonary disease or inflammatory bowel disease, and koilonychia, or "spoon-shaped" nails, which may indicate hemochromatosis or anaemia.
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Frequently asked questions
Early symptoms of endocarditis include flu-like symptoms such as fever, chills, and nausea. As the condition progresses, it can cause thin red or reddish-brown lines under the fingertips, known as splinter hemorrhages.
Splinter hemorrhages are thin, red or reddish-brown vertical lines that appear under the fingertips and run in the direction that the nail grows. They are a sign that either blood vessels have become swollen and damaged or small clots have injured the capillaries under the nails.
Splinter hemorrhages can be caused by trauma to the fingertip, local fungal infections, psoriasis, or other health issues. However, one possible reason is endocarditis.
If you notice dark brown, black, or red colour changes under your nails and haven't experienced nail trauma, it may be a symptom of a more serious condition, such as endocarditis. It is important to see a doctor as soon as possible to get evaluated.
Clubbing of the nails can suggest pulmonary disease or inflammatory bowel disease, while koilonychia, or "spoon-shaped" nails, may indicate hemochromatosis or anemia.









































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