Nail Discoloration and Lines: What Your Nails May Be Telling You

Healthy nails are typically smooth, strong, and consistent in color. However, many people notice changes such as yellowing, dark streaks, white spots, ridges, or brittle surfaces and wonder whether these alterations are normal. In many cases, nail changes are harmless. Yet occasionally, they can serve as clues that something else is happening inside the body.

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Why Nail Color Changes Occur

Nail discoloration can result from a wide variety of causes. Yellow nails are often associated with aging, smoking, nail polish staining, or fungal infections. Brown or black marks may appear after an injury that causes bleeding beneath the nail. In some cases, medications can also alter nail color.

White spots are among the most common nail changes. Contrary to popular myths, they are usually not caused by calcium deficiency. Instead, they often result from minor trauma to the nail matrix, the area where the nail grows.

Greenish discoloration can sometimes develop when bacteria become trapped under a lifted nail. Meanwhile, persistent dark streaks that appear without injury should always be evaluated by a healthcare professional, as they may occasionally indicate a more serious condition.

Understanding Nail Lines and Ridges

Vertical ridges running from the base to the tip of the nail are extremely common, especially with age. They are usually harmless and similar to wrinkles that develop in the skin over time.