Does a small crescent-shaped white area on the fingernail indicate cold body constitution or deficiency of qi and blood?

Generally speaking, fewer lunulae (the white half-moons on fingernails) may indicate cold body constitution or insufficient qi and blood. Detailed analysis is as follows:

Individuals with a cold body constitution typically have weak yang energy, which fails to adequately propel the circulation of qi and blood to the fingertips. The formation of nail lunulae depends on nourishment from qi and blood, and insufficient yang energy slows the speed and reduces the volume of blood reaching the fingertips. This inadequate nutrient supply for lunula growth can lead to fewer lunulae, smaller size, or even their disappearance, often accompanied by symptoms such as cold hands and feet and sensitivity to cold.

Qi and blood are fundamental for maintaining bodily functions, and fingernails, being distal tissues, are particularly sensitive to changes in qi and blood. When qi and blood are deficient, systemic circulation and nutrient delivery capacity decline, leaving the nails inadequately nourished. This can cause the lunulae to become fainter or fewer, and may also be accompanied by pallor, fatigue, and low energy.

When determining the cause of reduced lunulae, it is important to consider other bodily symptoms collectively, rather than relying solely on this single indicator. Engaging in moderate, gentle exercise regularly can help promote the circulation of qi and blood. In terms of diet, ingredients such as red dates and longan can be beneficial, though adjustments should be made according to individual body conditions. If the lunulae continue to diminish and are accompanied by significant discomfort, it is advisable to consult a healthcare professional to identify the underlying cause before initiating any调理 (regulatory) measures.