The Mystery Behind Black Lines on Nails Revealed - Verywell Health
5 days ago · A black line on your nail can range from benign (harmless) color variations to more serious conditions like melanoma. While sometimes harmless, any significant or sudden …
What Is Melanonychia? What Causes It and How It's Treated - WebMD
Sep 8, 2025 · Melanonychia is a brown or black stain in your fingernail or toenail. You can have a dark line on one nail, a few nails, or all of your nails. The line is caused by the natural color in...
Black Line on Nail: Causes and When To Seek Care - Health
Oct 30, 2025 · Melanonychia, a black line on your nail, can be a sign of melanoma or benign pigmentation changes. Injuries, medications, and conditions like hyperthyroidism may also …
Melanonychia: What It Is, Causes, and More - Healthline
Oct 3, 2023 · What Is Melanonychia? Do you have black or brown lines on your nail? This video explains what melanonychia is, what causes it, and how it can be treated.
Dark Nails: 6 Common Causes (& What to Do) - Tua Saúde
Dark nails are usually caused by direct blows to the fingers, habits like biting or pulling out your nails, or using antifungal or chemotherapy medications. In some cases, dark nails may be a …
What Do Black Fingernails Mean? - ScienceInsights
Nov 16, 2025 · While alarming, the color black is a symptom, not a diagnosis, resulting from various underlying processes. These causes range widely in severity, from minor injury to …
Why Do Fingernails Turn Black? Causes And Solutions Explained
Sep 17, 2025 · Black fingernails can be a cause for concern and may indicate an underlying issue. This discoloration often results from various factors, including trauma, such as crushing …
What Does It Mean When Your Fingernail Turns Black?
Dec 3, 2025 · Black discoloration beneath a fingernail or toenail is medically known as melanonychia when caused by pigment. This change can signify a wide range of underlying …
Black Line on the Nail: Causes, Treatments & When to Worry
Jun 17, 2025 · When you spot a black line on your nail, it’s easy to brush it off or assume it’s due to a recent bump or injury. But sometimes, this dark streak might be trying to tell you …
Black line on the nail: Causes, treatments, and pictures
Apr 24, 2024 · When a person has black or dark stripes running down their nails, the explanations can range from a natural occurrence to severe, such as melanoma.