Anonychia/hyponychia   Absent or hypoplastic nails
Chromonychia           Color changes of nails
Koilonychia            Spoon-shaped nails
Onychodystrophy        Degenerative changes of the nail
Onychogryposis         Hypertrophic shape changes of the nail
Onycholysis            Loosening/detachment of nail from nail bed
Onychomadesis          Spontaneous separation from the nail matrix
Onychomycosis          Fungal infections of the nail
Onychophagia           Nail biting
Onychoschizia          Splitting, horizontal layering of the distal
                         edge of the nail
Onychotillomania       Compulsive pulling or picking of nails
Paronychia            Inflammation of skin around nails

Retronychia           embedded shed nail into proximal nail fold   
Trachyonychia          Rough nails