Lines on your fingernails are common, and in most cases, they are harmless and do not mean you have cancer.However, certain nail changes can sometimes provide clues about your health, nutritional status, or an underlying medical condition.
The image above suggests that vertical lines on the nails are a warning sign of cancer. This claim is misleading. To understand what nail lines actually mean, it is important to distinguish between ordinary changes and those that deserve medical attention.
1. Vertical Lines on the Nails
Vertical lines, also called longitudinal ridges, run from the base of the nail toward the tip. They are particularly common as people get older.
Possible causes include:
- Natural aging.
- Dry nails and frequent handwashing.
- Repeated minor injuries to the nails.
- Certain skin conditions, such as eczema.
These lines are usually harmless when they appear gradually and affect several nails similarly.
2. Horizontal Lines Across the Nails
Horizontal grooves that cross the nail are sometimes called Beau’s lines. They can develop when nail growth temporarily slows or stops.
Possible causes include:
- A significant illness or high fever.
- Physical stress on the body.
- Certain medications.
- Severe nutritional deficiencies in some cases.
If several nails develop deep horizontal grooves without an obvious explanation, a medical evaluation may help identify the cause.
3. Dark Lines on the Nails
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