What do white spots on nails mean?

Small lunulae: Slow metabolism?
Small or absent lunulae can be a natural feature and do not necessarily indicate a health problem. However, in some cases, they could be associated with poor blood circulation, low blood pressure, or nutritional deficiencies, particularly iron or vitamin B12, two essential elements for red blood cell production and cellular energy. These signs should be evaluated in their entirety, along with other symptoms such as fatigue, to determine whether they truly reflect a slow metabolism or an underlying problem.

Missing lunulae: should you be concerned?
The absence of visible lunulae on the nails is generally normal, especially in children or people with short nails. This is not a cause for concern if this has always been the case. However, if the lunulae suddenly become invisible, this may warrant a medical consultation, as it could indicate a circulation problem, a nutritional deficiency (particularly vitamin B12), or hormonal disorders such as hypothyroidism. A clinical evaluation is necessary to identify the cause.
The lunula of each finger: a mirror of your organs
Each finger is associated with a specific organ. Here’s what changes in the lunulae can reveal:

Little finger: An enlarged lunula may indicate high blood pressure.
Ring finger: A faint lunula is often linked to digestive or reproductive problems. Middle
finger: An absent lunula may indicate cardiovascular problems.
Index finger: Changes in the lunula are usually associated with the pancreas or intestines.
Thumb: The lunula of the thumb reflects the condition of the lungs and spleen.
The color of the lunula: a warning signal
The color of the lunulae can also provide important indications about your health:
Gray: Sign of intense fatigue and digestive problems.
White: Normal color, indicating good health.
Purple: May indicate a blood circulation problem, causing dizziness.
Pink (red): Indicates low physical activity or lung problems.
Black: Very rare, but serious. This may be a sign of heavy metal poisoning.
Your nails are true barometers of your inner health. Observing the size, color, and presence of lunulae can help you detect abnormalities before symptoms appear. Take the time to examine your hands