What Causes the Absence of Lunulae (Half-Moon Marks) on the Fingernails?

In daily life, most people have a crescent-shaped, whitish area—commonly referred to as the “lunula”—at the base of their fingernails. However, some individuals lack this visible lunula. What causes the absence of the lunula?

What Causes the Absence of the Lunula?

The presence of a lunula on fingernails is often considered an indicator of good health, whereas its absence may suggest a “cold constitution” (a traditional Chinese medicine concept). Individuals with a cold constitution typically exhibit deficient Yang Qi and excessive Yin-Cold in the body. Such individuals commonly experience diminished organ function, sluggish circulation of Qi and blood, easy fatigue and lethargy, poor digestion and nutrient absorption, pallor, weakness in the limbs, heightened startle response, excessive drowsiness, increased susceptibility to colds—and recurrent or persistent colds—as well as general decline in vitality.

Lunula development is influenced by nutrition, environmental factors, and physical condition. When digestive and absorptive functions are impaired, the lunula may appear faint, reduced in number, or even disappear entirely. This phenomenon is frequently associated with deficiencies in trace elements—particularly calcium—and calcium supplementation is therefore recommended. Daily dietary habits should avoid picky eating. In addition to consuming animal-based protein sources such as meat, eggs, and poultry, individuals should also increase intake of foods rich in fats and carbohydrates (e.g., starches and sugars), as well as legume products, vegetables, and fruits. A reduced number of lunulae may correlate with colder ambient temperatures.

In males, absence of the lunula may be accompanied by signs of Yang deficiency. Clinically, oral administration of Gui Fu Di Huang Wan (a traditional Chinese herbal formula) may be advised for regulation; treatment duration typically ranges from one to three months. During this period, sexual activity should be moderated—ejaculation more than twice per week is not recommended. Regular physical exercise is encouraged to improve overall constitution. Foods that tonify Kidney-Yang—such as Chinese chives, dog meat, pork kidney, and ginger—should be consumed regularly. Individuals should pay close attention to any unusual or atypical physical signs; if deviations from normal are observed, timely medical evaluation is strongly advised. We hope this information proves helpful!