What are the underlying causes of splinter hemorrhages in nails?

Splinter hemorrhages appear as thin, dark lines under the nails and are caused by bleeding under the nail bed. This can happen when tiny blood vessels, called capillaries, get damaged or when small blood clots form.

Causes:

1. Injury: One common cause is trauma to the nail, such as hitting your finger, which can damage the blood vessels.
2. Infections: Some infections, like endocarditis, an infection of the heart valves, can lead to splinter hemorrhages.
3. Health Conditions: Other conditions, such as psoriasis or certain blood disorders, can also cause these nail changes.

Splinter hemorrhages are usually not serious if they result from minor injuries. However, if you notice many of them or if they appear without any known injury, it could be a sign of a more serious health issue. You can use a free symptom checker to help assess your symptoms and determine whether you should seek medical attention. A healthcare provider will be able to determine if an underlying condition needs attention.