Which vitamin deficiencies actually cause nail changes? This evidence-based guide sorts strong links from myths and tells you when a blood test beats a supplement.

Your nails can hint at your health. This visual guide explains nail anatomy, what common changes mean, and when a nail change deserves a doctor’s look.

Nail clubbing makes fingertips swell and nails curve downward. It can be hereditary or a sign of lung or heart conditions. Learn what to look for and when to see a doctor.

Nail lifting (onycholysis) means the nail separates from the nail bed. Learn the causes, how to care for it, and when lifting needs a doctor’s look.

Nail pitting means small dents in the nail surface, and psoriasis is the most common cause. Learn what pitting can signal and when to see a dermatologist.

Brittle and peeling nails are common and usually from dryness or repeated moisture changes. Learn the causes, what the biotin evidence really shows, and when to see a doctor.

Beau’s lines are horizontal dents that appear when nail growth pauses, usually after illness, fever, or stress. Learn what they mean and when to see a doctor.

Yellow nails are usually from staining or a fungal infection. Learn the causes, how to tell them apart, and when yellow nails warrant a doctor visit.

Vertical ridges on nails are usually a normal sign of aging. Learn what causes them, when they could mean more, and simple ways to care for ridged nails.

White spots on nails are usually from minor trauma, not calcium deficiency. Learn what actually causes them, when they matter, and how they grow out.