10 Nail Changes That May Indicate an Underlying Health Issue

8. Half-and-Half Nails - Kidney Disease Markers

Half-and-half nails, also known as Lindsay's nails, present a distinctive appearance where the proximal portion of the nail (closest to the cuticle) appears white or pale, while the distal portion (toward the tip) maintains a normal pink or reddish-brown coloration. This striking bicolor pattern typically affects all fingernails and creates a clear demarcation line roughly halfway across the nail plate. The condition was first described by Dr. P.G. Lindsay in 1967 in patients with chronic kidney disease, and it remains most strongly associated with chronic renal failure and uremia. The pathophysiology involves changes in the nail bed's vascular supply and possibly the accumulation of uremic toxins that affect nail bed coloration. Studies indicate that half-and-half nails occur in approximately 20-50% of patients with chronic kidney disease, with prevalence increasing as kidney function declines. The white proximal portion is thought to result from decreased blood flow and edema in the nail bed, while the preserved distal coloration reflects areas with better vascular perfusion. While chronic kidney disease remains the primary association, half-and-half nails can occasionally be seen in other conditions including liver disease, heart failure, HIV infection, Kawasaki disease, and zinc deficiency. The presence of half-and-half nails, particularly when they develop acutely or are accompanied by other symptoms such as swelling, fatigue, or changes in urination, should prompt evaluation of kidney function through blood tests including creatinine, blood urea nitrogen, and estimated glomerular filtration rate.