Curved nails disease is also called as Koilonychia. Curved nails is a change in the character of the nail plate and usually a concavity in the nail. It is indicative of oxygen content of the blood going to the toe nail. It cause from Iron, Zinc, Vitamin B12 & Vitamin D deficiency. So we think in terms of lung infections, emphysema, some type of problem with the lungs that doesn’t oxygenate the blood enough to cause the most distal part of our body to grow properly.
Same thing with club nails where the nail changes in the opposite position. because the nail is starved for oxygen Think if you see a change on the nail plate to that degree whether it’s clubbing or Koilonychia, I think it probably does relate to a more systemic disease.
Causes of Koilonychia (curved nails)
- Nutritional deficiencies
- Systemic disease
- Autoimmune disorders
The reason that the nail shows lots of different pathologies is because the nail is very sensitive to oxygen content. and oxygen content comes from the blood. blood is oxygenated at the level of the lungs. so most of these changes we see in the nail plate most likely are associated with lung type diseases. but I don’t know that I would run directly to a pulmonologist I would see your family doctor, follow up with a dermatologist and then be referred to a pulmonologist
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