Your Nails Are Warning You – Here’s What They Mean

3.Dark Lines Beneath the Nail

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Dark lines or streaks under the nails can result from trauma, such as pinching your finger, which causes bleeding beneath the nail. However, if you notice dark streaks without any injury, it's crucial to see a doctor immediately, as this could indicate skin cancer. Medically known as melanonychia, these dark streaks are particularly concerning when they appear on a single nail. While some lines can be harmless and related to medication, pregnancy, or ethnicity, any new or changing line should be examined by a healthcare provider. Subungual melanoma, a type of skin cancer, is the most serious concern. Early detection is vital, so any unexplained dark line—especially one that widens or darkens over time—should be evaluated promptly.