What could a horizontal red line on my nail bed signify?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A horizontal red line on your nail, often called a splinter hemorrhage, can result from several causes. The most common include nail trauma, but it may also signal underlying conditions such as endocarditis, psoriasis, vasculitis, or a vitamin deficiency. Key points to know:

Trauma is the most frequent cause and usually resolves on its own.
Infections like endocarditis can produce these lines and require urgent care.
Skin conditions such as psoriasis may cause nail changes alongside other symptoms.
Nutritional deficiencies (iron, vitamin C) can also contribute.

Because a red horizontal line can indicate anything from a minor bump to a serious systemic issue, identifying accompanying symptoms is critical. Rather than guessing, take a free, instant, online symptom check to clarify possible causes and get personalized guidance on your next steps—so you know whether to monitor at home or seek prompt medical care.

Reviewed for medical accuracy: 07/15/2026

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Explanation

A horizontal red line on your nail, also known as a nail band, can have several possible causes. According to the medical literature, these lines might be due to trauma to the nail, where the nail bed gets injured and causes a visible line as it grows out. In some cases, these lines can also be linked to systemic health conditions.

Possible Causes:

Trauma: If you have recently injured your nail, this could cause a red line.
Systemic Conditions: Some health issues, like certain infections or other systemic conditions, might cause changes in the nail.

What to Do:

Observe: Keep an eye on any other symptoms you might be experiencing.
Consult a Healthcare Provider: If the line persists or you have other symptoms, it's important to seek medical advice for a proper diagnosis.

Understanding the color and shape of nail lines, as discussed in the medical references, can provide clues about your health. To help identify what might be causing your symptoms, you can check your symptoms with Ubie's free AI-powered tool for personalized guidance. If you're concerned, it's best to consult with a healthcare provider who can evaluate your specific situation.

(References)

Chang C, Beutler BD, & Cohen PR. (2017). Report of a Patient with Multiple Horizontal Red Bands .... Dermatology and therapy, 28260214.
Oanță A, Iliescu V, & Țărean S. (2017). Half and Half Nails in a Healthy Person. Acta dermatovenerologica Croatica : ADC, 30064606.
Lipner SR, & Scher RK. (2016). Evaluation of nail lines: Color and shape hold clues. Cleveland Clinic journal of medicine, 27168515.

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