Nails can reveal early signs of health problems, and experts say changes in color, shape, or texture should not be ignored. Dr. Zainab Laftah explains that unusual colors such as “white, yellow, blue, black, and red” often signal deeper medical issues rather than cosmetic ones.

White or pale nails may indicate anemia, heart, or kidney issues, and white spots or streaks may reflect allergies, trauma, diabetes, or fungal infections. Yellow nails can suggest thyroid disorders, lung disease, or chronic fungal infections. Blue nails usually mean low oxygen levels linked to heart or lung problems, while persistent dark streaks may point to melanoma. Red nails may be related to heart disease, kidney issues, or autoimmune conditions like lupus.

Nail shape changes can also offer important clues. Spoon-shaped nails, where the edges curve upward, may signal iron deficiency or cardiovascular disease. Clubbing—swollen fingertips and rounded nail beds—is associated with heart and lung disorders, digestive problems, and chronic infections, and should be checked by a doctor.

Texture matters as well. Brittle nails may result from hypothyroidism or nutrient deficiencies. Small pits can indicate psoriasis, while vertical ridges may suggest shortages of vitamin B12, iron, zinc, or magnesium. Weakness, chipping, or peeling may be linked to low vitamins A or C.

Because nails reflect both local and internal health, persistent changes can offer early warnings before other symptoms appear. Anyone with ongoing or unexplained nail changes should consult a healthcare professional for proper evaluation and treatment.