Q & A Library

Print this page | Sign up for free e-bulletins

Worried about White Spots on Fingernails?

I sometimes get white spots on my fingernails. I've been told that they're a sign of a calcium deficiency, but I get plenty of calcium from my diet, and I do take a supplement every day. What causes the spots?

Answer (Published 2/11/2005)

The white spots on nail you notice are not caused by a calcium deficiency. These white spots in fingernails are called "leukonychia" and are very common. Most of the time the white spots simply are a sign of some past injury to the matrix (base) of your nails. By the time the white spot shows up (about six weeks after the injury) you’ve probably forgotten all about banging or knocking your fingers. Sometimes, the injury can stem from a manicure that put excessive pressure on the base of the nails. White fingernail spots also can be a sign of an allergic reaction to nail polish or nail hardeners and, sometimes, are a symptom of a mild infection.

Related Weil Products
Dr. Weil on Healthy Aging - Your Online Guide to the Anti-Inflammatory Diet! - Everything you need to get started eating a healthful, satisfying diet is here - including eating and shopping guides, over 300 recipes, and an exclusive version of Dr. Weil's Anti-Inflammatory Food Pyramid! Start your 14-day free trial now - and start eating anti-inflammatory today!

Whatever the cause, white spots on fingernails are temporary and will grow out as your nails grow. However, it can take more than eight months for nails to grow out completely so the spots may be around for a while.

Sometimes, a change in the appearance of your nails does indicate an underlying disease, but these changes would be more dramatic than just the occasional white spot. Nails that turn completely white, for example, can indicate liver disease, but by the time this happens, you probably would have other symptoms.

Incidentally, in addition to the myth that white spots in fingernails are a sign of calcium deficiency, you may also have heard that they indicate a zinc deficiency. That isn’t true either. Neither is the well known but bizarre notion that the spots are due to eating too much Hellmann’s mayonnaise (I’m not making this up).

Andrew Weil, M.D.

Creative Commons License Some Rights Reserved Creative Commons Copyright Notice
A portion of the original material created by Weil Lifestyle on DrWeil.com (specifically, all question and answer-type articles in the Dr. Weil Q&A Library) is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.