Why nail changes matter
Nails can sometimes reveal clues about overall health. As people age, it is normal for nails to change slightly in color, texture, or shape. However, certain lines or marks may signal underlying health concerns. As the article explains, “After age 40, changes in your nails—especially unusual lines—should not be ignored.”

Horizontal lines
Horizontal grooves across the nail, known as Beau’s lines, may appear after the body experiences physical stress or illness. These lines can sometimes indicate past infections, serious stress, or chronic conditions such as diabetes or circulation problems.

Vertical ridges
Vertical ridges running from the base to the tip of the nail are often associated with aging and are usually harmless. However, if the ridges become unusually deep or uneven, they may suggest possible nutritional deficiencies, such as low iron or vitamin B12 levels.

Dark or white lines
Sudden dark streaks on the nail should be taken seriously, as they may be linked to melanoma, a dangerous form of skin cancer. White lines, sometimes called Muehrcke’s lines, may also appear and could be connected to liver or kidney issues or low protein levels.

Paying attention to warning signs
While many nail changes are harmless, unusual or sudden lines should be evaluated by a healthcare professional. Nails can sometimes show early signs of health problems before other symptoms appear, making it important to notice and address these changes promptly.