Are White Spots on Your Nails a Calcium Deficiency?

Farzollah Gholizadeh and Fariba Bayrami

“You’ve got white spots on your nails — you must be low on calcium.”

You have probably heard this since childhood. It is one of the most common beliefs about nail health.

But this explanation is an oversimplification.

What usually causes white spots?

The most common cause of small white dots on the nails is minor knocks to the area where the nail forms (the nail root).

These knocks can be so small you don’t even remember them: bumping a door, hitting a table, a rough manicure or pushing back the cuticles.

Because nails grow slowly, the mark from the knock only shows up as a spot weeks later . That is why most people never link the spot to the knock.

What other causes are there?

• Frequent manicures, long-wear polish and gel treatments
• Frequent contact with detergents and chemicals
• Fungal infection (usually causes a wider whitening or yellowing rather than spots)
• Some general health conditions (rarer; usually affect a large part of the nail or several nails rather than a single dot)

So does nutrition play no role at all?

It can. A thorough assessment also looks at nutritional status, the absorption of nutrients and certain micronutrients.

But it is important to know this:

A deficiency of a specific nutrient cannot be diagnosed from a single white dot.

If calcium or another deficiency is suspected, it should be assessed with a blood test and other symptoms.

The traditional medicine view

In Avicennian–Greek medicine, the nail is one of the tools for reading the body — but never on its own . The quality of the nail is assessed together with the skin, hair, tongue, digestion, sleep and pulse.

A basic principle of traditional medicine applies here too: the quality of a tissue depends on the quality of digestion and nourishment. If there are problems with digestion and absorption, these may over time show in the nails as well.

4 questions to ask when you look at a spot

• Is there one spot or many? A single dot usually points to a knock.
• Is it on one nail or several? Several nails affected at the same time makes general causes more likely.
• Does the spot move up as the nail grows? If it does, it is most likely the mark of a past knock.
• Are there other signs? Is it accompanied by brittleness, a change in shape, tiredness, pallor or digestive complaints?

When should you see a doctor?

• If the whiteness covers most of the nail
• If several nails are affected at the same time
• If the nail is thickening, turning yellow or lifting from its bed
• If the whiteness comes with general symptoms such as tiredness, pallor or weight loss

Frequently asked questions

Do white spots on the nails go away?
Yes. Spots caused by a knock move up as the nail grows and disappear when it is trimmed.

Should I take a calcium supplement for white spots?
Starting a supplement just because of a spot is not the right approach. If a deficiency is suspected, get a blood test first.

Are white spots normal in children?
Children bump into things often, so white spots are very common in them too.

Conclusion

A white spot on the nail is usually the harmless mark of a knock. Rather than treating it as proof of a deficiency on its own, read it together with the overall state of the nail and the body’s other signs .

To learn everything nails can tell you about your health, read our article “What Do Your Nails Say About Your Health?” .

If you want to learn the body’s sign language step by step, Dr Kalan’s book “Elaim & Delail” and the online course “ “Reading the Body’s Signs” (in Turkish) will guide you.

This article is for information only and does not replace medical diagnosis and treatment.