They grow steadily—about 2–3 millimeters per month.
When the body experiences stress, nutritional deficiency, infection, or chronic illness, nail growth and appearance may change.
One of the most common changes is brittle or easily broken nails.
While this can result from frequent exposure to water, chemicals, or aging, it may also indicate iron deficiency anemia or thyroid disorders.
Iron plays a critical role in oxygen transport within the blood. When iron levels are low, tissues—including the nail matrix—may not receive adequate oxygen, leading to thin, fragile nails.
Hypothyroidism (an underactive thyroid) can also slow nail growth and make nails dry and brittle due to reduced metabolic activity.
Another well-known nail sign is spoon-shaped nails, medically called koilonychia. In this condition, the nails curve upward at the edges, forming a concave shape that can hold a drop of water.
This is often associated with iron deficiency anemia. In some cases, it may also relate to chronic blood loss, liver disorders, or genetic conditions.
When spooning appears alongside fatigue, pale skin, or shortness of breath, a blood test is strongly recommended.
Yellow nails can have multiple causes.
Mild yellowing may result from nail polish staining or fungal infection.
However, persistent yellow nails—especially when thickened and slow-growing—can indicate a rare condition called yellow nail syndrome, which is associated with respiratory disorders and lymphatic problems.
In other cases, yellowing may be linked to diabetes, where high blood sugar levels affect circulation and immune function, increasing susceptibility to fungal infections.
Bluish or purple nails may signal insufficient oxygen in the blood.
This condition, called cyanosis, can be related to lung diseases such as chronic obstructive pulmonary disease (COPD), asthma, pneumonia, or heart conditions that impair oxygen delivery.
When the nail bed appears blue and is accompanied by shortness of breath or chest discomfort, immediate medical evaluation is necessary.
White nails can also be meaningful.
Completely white nails with a darker rim at the tip (a condition called Terry’s nails) may be associated with liver disease, congestive heart failure, or diabetes.
Partial whitening can sometimes indicate kidney disease or low protein levels in the blood.
However, small white spots on the nail plate are usually harmless and often result from minor trauma rather than calcium deficiency, which is a common myth.
Dark lines beneath the nail should be carefully evaluated.
While some pigmentation is harmless, especially in individuals with darker skin tones, a dark vertical streak can sometimes indicate subungual melanoma, a serious form of skin cancer.
If a dark stripe appears suddenly, changes shape, or extends into the surrounding skin, a dermatologist should examine it promptly.
Clubbing of the nails is another important sign.
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