Rippled fingernails reveal secrets of possible disease

In some cases, they may be often a mirror of nutritional deficiencies, such as a lack of certain minerals or vitamins ( vitamin B12, magnesium, or iron).

Vertical ridges are common with aging and are often harmless. However, if they appear suddenly or become more pronounced, it may be worth checking for conditions like anemia or thyroid issues.

Horizontal Stripes
Horizontal stripes or grooves, also called Beau’s lines, may show more specific health concerns.

These horizontal indentations can appear after physical trauma to the nail, or from serious illnesses or medical conditions, including malnutrition, uncontrolled diabetes, heart attacks or respiratory diseases.

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The appearance of these ridges is often associated with temporary disruptions in nail growth caused by periods of intense stress or illness, as the body may temporarily slow down or halt nail growth.

According to the NCBI, if growth of the grooves is “abrupt, [it] indicates a sudden attack of disease.” And, when present on all 20 nails, it’s “usually the result of systemic disease such as mumps, pneumonia, coronary thrombosis, Kawasaki disease, syphilis, and hypoparathyroidism.”
White Stripes
White, parallel horizontal lines that do not indent the nail surface may indicate liver or kidney issues. These lines, called Muehrcke’s lines, tend to fade temporarily when the nail is pressed and often appear on multiple nails simultaneously.