Can a red line on my nail be a sign of cancer?

Reviewed by Yoshinori Abe, MD

Internal Medicine

A red line on your nail, known as a splinter hemorrhage, can sometimes signal a serious condition like subungual melanoma (a form of skin cancer), heart infection (endocarditis), or an autoimmune disorder. However, red lines under the nails are often caused by less serious issues, such as minor trauma, psoriasis, or a fungal infection. Because the underlying cause can range from harmless to life-threatening, it's essential to have any new or unexplained red line on your nail evaluated by a healthcare professional.

Not sure whether your symptom warrants urgent care or a routine visit? Taking a free, instant, online symptom check can help you quickly narrow down possible causes based on your unique health profile and guide you toward the right next step—whether that's monitoring at home, seeing a dermatologist, or getting immediate care. It's a smart, no-cost way to turn uncertainty into a clear action plan.

Reviewed for medical accuracy: 07/15/2026

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Explanation

A red line on your nail, known as longitudinal erythronychia, can sometimes be a sign of a serious condition, including cancer. According to the medical literature, these lines can appear as individual or multiple red streaks on the nail. While they can be associated with benign conditions, they may also be indicative of malignancies, making it crucial to seek a professional evaluation.

Key Points to Consider:

Possible Causes:

Red lines can be due to benign conditions or trauma.
They may also signal more serious issues, including skin cancer.

Importance of Evaluation:

A healthcare provider can determine the cause of the red line.
Early detection of any serious condition is important for effective treatment.

Action Steps:

If you notice a red line on your nail, start by using Ubie's free AI symptom checker to help you understand your symptoms better, then consult a healthcare professional for a proper diagnosis.

In summary, while a red line on the nail can be alarming, it doesn't always mean cancer. However, it's important to have it checked to rule out any serious conditions.

(References)

Cohen PR. (2011). Longitudinal erythronychia: individual or multiple linear red .... American journal of clinical dermatology, 21668031.
Rashid RM, Torres-Cabala C, & Chon S. (2011). the value of cosmetic alterations in nail findings. Skinmed, 21409965.
Kato T, Usuba Y, Takematsu H, Kumasaka N, Tanita Y, Hashimoto K, et al. (1989). A rapidly growing pigmented nail streak resulting in diffuse .... Cancer, 2804909.

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