10/07/2026
Like your skin, your nails can say a lot about your health. Ten changes and what each one can point to, from the American Academy of Dermatology, NIH's MedlinePlus and the NHS:
1. Thin, spoon-shaped nails: low iron
2. Small pits or dents: psoriasis, eczema or alopecia areata
3. Deep grooves across the nail: something slowed nail growth for a while, like a fever, an injury or major stress. They grow out
4. Lines running the length of the nail: common and usually nothing to worry about
5. Pale nails: anemia
6. Blue nails: not enough oxygen in the blood (cold can do it too)
7. Yellow nails that thicken and seem to stop growing: a nail infection or lung disease. Polish and smoking also stain nails yellow
8. A nail lifting off its bed: often a fungal infection, psoriasis or an injury; thyroid disease is on the list too
9. A new or changing dark streak: it could be melanoma, a skin cancer. Not every dark streak is, but this is the one to have a dermatologist look at
10. Nails curving down over rounded fingertips: can run in the family, and can be a sign of heart or lung disease
The catch: a nail can't diagnose anything. The NHS says nail problems are not usually caused by anything serious, and most come from injuries, nail biting, water and cleaning products, or a fungal infection.
Worth a doctor's visit: a nail that has changed shape or colour, or fallen off, and you don't know why. Blue nails or lips with trouble breathing or chest pain are an emergency.
Be honest: when did you last look at your bare nails? Save this and check tonight.
Sources in the pinned comment.
General wellness education only - not medical advice.