Red lunula may indicate underlying systemic health issues

A medical review published in the ‘American Journal of the Medical Sciences’ by researchers from Rutgers New Jersey Medical School has examined the significance of a red lunula—the white, half-moon shaped area at the base of the nail.

While the lunula is typically white, a shift to red may be a subtle indicator of underlying systemic issues. The review notes that when redness appears in multiple nails, it may be linked to broader health conditions such as cardiovascular disease, liver cirrhosis, autoimmune disorders, rheumatoid arthritis, and certain blood or skin diseases. In contrast, redness appearing in only a single nail is more likely to be a localized issue, such as infection, bleeding, or a subungual tumor.

Researchers suggest the phenomenon might be caused by the dilation of capillaries under the nail, increasing blood flow to the area. Although the presence of a red lunula is not a definitive diagnosis on its own, experts suggest it warrants medical investigation, particularly when accompanied by other symptoms like shortness of breath, jaundice, or joint swelling.