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Common causes of koilonychia
| Idiopathic | |||||
| Physiological | Early childhood | ||||
| Congenital | LEOPARD syndrome | ||||
| Ectodermal dysplasias | |||||
| Trichothiodystrophy | |||||
| Nail-patella syndrome | |||||
| Acquired | Metabolic/endocrine | Acromegaly | |||
| Hemochromatosis | |||||
| Iron deficiency | |||||
| Porphyria | |||||
| Renal dialysis/transplant | |||||
| Thyroid disease | |||||
| Dermatoses | Alopecia areata | ||||
| Darier disease | |||||
| Lichen planus | |||||
| Psoriasis | |||||
| Raynaud disease | |||||
| Exogenous | Occupational | ||||
| Traumatic | |||||
| Infections | Onychomycosis | ||||
| Syphilis | |||||
| Carpal tunnel syndrome | |||||
